| Segment Reporting, Reconciliation of Revenue by Segment to Consolidated [Table Text Block] |
| | | Manufacturing | | | Distribution | | | Corporate | | | Elimination and adjustments | | | Consolidated | |
| Net sales: | | | | | | | | | | | | | | | | | | | | |
| Net sales | | $ | 83,528 | | | $ | 32,644 | | | $ | - | | | $ | (19,478 | ) | | $ | 96,694 | |
| Intra-segment sales | | | (2,015 | ) | | | (4,982 | ) | | | - | | | | 6,997 | | | | - | |
| Inter-segment sales | | | (11,441 | ) | | | (1,040 | ) | | | - | | | | 12,481 | | | | - | |
| Total consolidated net sales | | | 70,072 | | | | 26,622 | | | | - | | | | - | | | | 96,694 | |
| | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold: | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold | | | 64,623 | | | | 24,238 | | | | - | | | | 19,298 | | | | 69,563 | |
| Intra-segment cost of goods sold | | | (2,015 | ) | | | (4,982 | ) | | | - | | | | (6,997 | ) | | | - | |
| Inter-segment cost of goods sold | | | (11,441 | ) | | | (1,040 | ) | | | - | | | | (12,481 | ) | | | - | |
| Total consoldiated cost of goods sold | | | 51,167 | | | | 18,216 | | | | - | | | | (180 | ) | | | 69,563 | |
| | | | | | | | | | | | | | | | | | | | | |
| Gross profit | | | 18,905 | | | | 8,406 | | | | - | | | | (180 | ) | | | 27,131 | |
| | | | | | | | | | | | | | | | | | | | | |
| Marketing, engineering and administrative expenses | | | 11,317 | | | | 3,619 | | | | 6,319 | | | | - | | | | 21,255 | |
| Other operating income | | | 54 | | | | - | | | | - | | | | - | | | | 54 | |
| Operating income (loss) | | | 7,534 | | | | 4,787 | | | | (6,319 | ) | | | (180 | ) | | | 5,822 | |
| | | | | | | | | | | | | | | | | | | | | |
| Other income (expense): | | | | | | | | | | | | | | | | | | | | |
| Interest income | | | 389 | | | | 133 | | | | 488 | | | | (1,013 | ) | | | (3 | ) |
| Interest expense | | | (1,784 | ) | | | (2 | ) | | | (17 | ) | | | 1,013 | | | | (790 | ) |
| Other income (expense) | | | (2,101 | ) | | | (1,094 | ) | | | 3,587 | | | | (26 | ) | | | 366 | |
| Total consolidated other income (expense) | | | (3,496 | ) | | | (963 | ) | | | 4,058 | | | | (26 | ) | | | (427 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Pretax earnings (loss) | | | 4,038 | | | | 3,824 | | | | (2,261 | ) | | | (206 | ) | | | 5,395 | |
| | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | (164 | ) | | | (946 | ) | | | (3,136 | ) | | | 2,407 | | | | (1,839 | ) |
| Net income (loss) | | | 3,874 | | | | 2,878 | | | | (5,397 | ) | | | 2,201 | | | | 3,556 | |
| | | | | | | | | | | | | | | | | | | | | |
| Minority interest | | | - | | | | 231 | | | | - | | | | - | | | | 231 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | $ | 3,874 | | | $ | 2,647 | | | $ | (5,397 | ) | | $ | 2,201 | | | $ | 3,325 | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| Depreciation and amortization | | $ | 2,896 | | | $ | 102 | | | $ | 427 | | | $ | - | | | $ | 3,425 | |
| Expenditures for segment assets | | | 2,116 | | | | 488 | | | | 2,566 | | | | - | | | | 5,170 | |
| | | Manufacturing | | | Distribution | | | Corporate | | | Elimination and adjustments | | | Consolidated | |
| Net sales: | | | | | | | | | | | | | | | | | | | | |
| Net sales | | $ | 72,484 | | | $ | 30,138 | | | $ | - | | | $ | (21,380 | ) | | $ | 81,242 | |
| Intra-segment sales | | | (1,970 | ) | | | (5,200 | ) | | | - | | | | 7,170 | | | | - | |
| Inter-segment sales | | | (13,246 | ) | | | (964 | ) | | | - | | | | 14,210 | | | | - | |
| Total consolidated net sales | | | 57,268 | | | | 23,974 | | | | - | | | | - | | | | 81,242 | |
| | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold: | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold | | | 57,283 | | | | 23,768 | | | | - | | | $ | 21,515 | | | | 59,536 | |
| Intra-segment cost of goods sold | | | (1,970 | ) | | | (5,200 | ) | | | - | | | | (7,170 | ) | | | - | |
| Inter-segment cost of goods sold | | | (13,246 | ) | | | (964 | ) | | | - | | | | (14,210 | ) | | | - | |
| Total consolidated cost of goods sold | | | 42,067 | | | | 17,604 | | | | - | | | | 135 | | | | 59,536 | |
| | | | | | | | | | | | | | | | | | | | | |
| Gross profit | | | 15,201 | | | | 6,370 | | | | - | | | | 135 | | | | 21,706 | |
| | | | | | | | | | | | | | | | | | | | | |
| Marketing, engineering and administrative expenses | | | 9,863 | | | | 3,456 | | | | 6,440 | | | | - | | | | 19,759 | |
| Operating income (loss) | | | 5,338 | | | | 2,914 | | | | (6,440 | ) | | | 135 | | | | 1,947 | |
| | | | | | | | | | | | | | | | | | | | | |
| Other income (expense): | | | | | | | | | | | | | | | | | | | | |
| Interest income | | | 255 | | | | 141 | | | | 390 | | | | (775 | ) | | | 11 | |
| Interest expense | | | (1,422 | ) | | | (2 | ) | | | (11 | ) | | | 775 | | | | (660 | ) |
| Other income (expense) | | | (2,189 | ) | | | (285 | ) | | | 918 | | | | (22 | ) | | | (1,578 | ) |
| Total consolidated other income (expense) | | | (3,356 | ) | | | (146 | ) | | | 1,297 | | | | (22 | ) | | | (2,227 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Pretax earnings (loss) | | | 1,982 | | | | 2,768 | | | | (5,143 | ) | | | 113 | | | | (280 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | (705 | ) | | | (685 | ) | | | - | | | | 248 | | | | (1,142 | ) |
| Net income (loss) | | | 1,277 | | | | 2,083 | | | | (5,143 | ) | | | 361 | | | | (1,422 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Minority interest | | | - | | | | 50 | | | | - | | | | - | | | | 50 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | $ | 1,277 | | | $ | 2,033 | | | $ | (5,143 | ) | | $ | 361 | | | $ | (1,472 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| Depreciation and amortization | | $ | 3,256 | | | $ | 83 | | | $ | 320 | | | $ | - | | | $ | 3,659 | |
| Expenditures for segment assets | | | 1,600 | | | | 209 | | | | 500 | | | | - | | | | 2,309 | |
| | | Manufacturing | | | Distribution | | | Corporate | | | Elimination and adjustments | | | Consolidated | |
| Net sales: | | | | | | | | | | | | | | | | | | | | |
| Net sales | | $ | 239,670 | | | $ | 79,781 | | | $ | - | | | $ | (52,581 | ) | | $ | 266,870 | |
| Intra-segment sales | | | (6,285 | ) | | | (12,277 | ) | | | - | | | | 18,562 | | | | - | |
| Inter-segment sales | | | (31,375 | ) | | | (2,644 | ) | | | - | | | | 34,019 | | | | - | |
| Total consolidated net sales | | | 202,010 | | | | 64,860 | | | | - | | | | - | | | | 266,870 | |
| | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold: | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold | | | 185,390 | | | | 62,367 | | | | - | | | | 53,319 | | | | 194,438 | |
| Intra-segment cost of goods sold | | | (6,285 | ) | | | (12,277 | ) | | | - | | | | (18,562 | ) | | | - | |
| Inter-segment cost of goods sold | | | (31,375 | ) | | | (2,644 | ) | | | - | | | | (34,019 | ) | | | - | |
| Total consolidated cost of goods sold | | | 147,730 | | | | 47,446 | | | | - | | | | 738 | | | | 194,438 | |
| | | | | | | | | | | | | | | | | | | | | |
| Gross profit | | | 54,280 | | | | 17,414 | | | | - | | | | 738 | | | | 72,432 | |
| | | | | | | | | | | | | | | | | | | | | |
| Marketing, engineering and administrative expenses | | | 32,989 | | | | 11,031 | | | | 18,587 | | | | - | | | | 62,607 | |
| Other operating income | | | 54 | | | | - | | | | (374 | ) | | | - | | | | (320 | ) |
| Operating income (loss) | | | 21,237 | | | | 6,383 | | | | (18,213 | ) | | | 738 | | | | 10,145 | |
| | | | | | | | | | | | | | | | | | | | | |
| Other income (expense): | | | | | | | | | | | | | | | | | | | | |
| Interest income | | | 1,156 | | | | 399 | | | | 1,458 | | | | (2,991 | ) | | | 22 | |
| Interest expense | | | (5,277 | ) | | | (7 | ) | | | (70 | ) | | | 2,991 | | | | (2,363 | ) |
| Other income (expense) | | | (9,210 | ) | | | (3,353 | ) | | | 11,499 | | | | (76 | ) | | | (1,140 | ) |
| Total consolidated other income (expense) | | | (13,331 | ) | | | (2,961 | ) | | | 12,887 | | | | (76 | ) | | | (3,481 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Pretax earnings (loss) | | | 7,906 | | | | 3,422 | | | | (5,326 | ) | | | 662 | | | | 6,664 | |
| | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | (12,394 | ) | | | (1,551 | ) | | | 33,496 | | | | (593 | ) | | | 18,958 | |
| Net income (loss) | | | (4,488 | ) | | | 1,871 | | | | 28,170 | | | | 69 | | | | 25,622 | |
| | | | | | | | | | | | | | | | | | | | | |
| Minority interest | | | - | | | | 444 | | | | - | | | | - | | | | 444 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | $ | (4,488 | ) | | $ | 1,427 | | | $ | 28,170 | | | $ | 69 | | | $ | 25,178 | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| Total consolidated assets | | $ | 506,291 | | | $ | 66,209 | | | $ | (173,776 | ) | | $ | (7,705 | ) | | $ | 391,019 | |
| | | | | | | | | | | | | | | | | | | | | |
| Depreciation and amortization | | $ | 8,908 | | | $ | 292 | | | $ | 1,025 | | | $ | - | | | $ | 10,225 | |
| Expenditures for segment assets | | | 7,784 | | | | 682 | | | | 1,840 | | | | - | | | | 10,306 | |
| | | Manufacturing | | | Distribution | | | Corporate | | | Elimination and adjustments | | | Consolidated | |
| Net sales: | | | | | | | | | | | | | | | | | | | | |
| Net sales | | $ | 212,265 | | | $ | 95,448 | | | $ | - | | | $ | (63,653 | ) | | $ | 244,060 | |
| Intra-segment sales | | | (5,172 | ) | | | (16,164 | ) | | | - | | | | 21,336 | | | | - | |
| Inter-segment sales | | | (39,102 | ) | | | (3,215 | ) | | | - | | | | 42,317 | | | | - | |
| Total consolidated net sales | | | 167,991 | | | | 76,069 | | | | - | | | | - | | | | 244,060 | |
| | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold: | | | | | | | | | | | | | | | | | | | | |
| Cost of goods sold | | | 170,550 | | | | 74,756 | | | | - | | | $ | 63,954 | | | | 181,352 | |
| Intra-segment cost of goods sold | | | (5,171 | ) | | | (16,164 | ) | | | - | | | | (21,335 | ) | | | - | |
| Inter-segment cost of goods sold | | | (39,102 | ) | | | (3,215 | ) | | | - | | | | (42,317 | ) | | | - | |
| Total consolidated cost of goods sold | | | 126,277 | | | | 55,377 | | | | - | | | | 302 | | | | 181,352 | |
| | | | | | | | | | | | | | | | | | | | | |
| Gross profit | | | 41,714 | | | | 20,692 | | | | - | | | | 302 | | | | 62,708 | |
| | | | | | | | | | | | | | | | | | | | | |
| Marketing, engineering and administrative expenses | | | 28,372 | | | | 11,118 | | | | 18,676 | | | | - | | | | 58,166 | |
| Operating income (loss) | | | 13,342 | | | | 9,574 | | | | (18,676 | ) | | | 302 | | | | 4,542 | |
| | | | | | | | | | | | | | | | | | | | | |
| Other income (expense): | | | | | | | | | | | | | | | | | | | | |
| Interest income | | | 676 | | | | 410 | | | | 1,182 | | | | (2,198 | ) | | | 70 | |
| Interest expense | | | (2,932 | ) | | | (988 | ) | | | (69 | ) | | | 2,198 | | | | (1,791 | ) |
| Other income (expense) | | | (2,554 | ) | | | (2,802 | ) | | | 2,831 | | | | (70 | ) | | | (2,595 | ) |
| Total consolidated other income (expense) | | | (4,810 | ) | | | (3,380 | ) | | | 3,944 | | | | (70 | ) | | | (4,316 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Pretax earnings (loss) | | | 8,532 | | | | 6,194 | | | | (14,732 | ) | | | 232 | | | | 226 | |
| | | | | | | | | | | | | | | | | | | | | |
| Income tax benefit (expense) | | | (1,959 | ) | | | (2,054 | ) | | | 227 | | | | 466 | | | | (3,320 | ) |
| Net income (loss) | | | 6,573 | | | | 4,140 | | | | (14,505 | ) | | | 698 | | | | (3,094 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| Minority interest | | | - | | | | 223 | | | | - | | | | - | | | | 223 | |
| Net income (loss) attributable to Twin Disc, Incorporated | | $ | 6,573 | | | $ | 3,917 | | | $ | (14,505 | ) | | $ | 698 | | | $ | (3,317 | ) |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| Total consolidated assets | | $ | 495,226 | | | $ | 40,854 | | | $ | (195,317 | ) | | $ | (7,881 | ) | | $ | 332,882 | |
| | | | | | | | | | | | | | | | | | | | | |
| Depreciation and amortization | | $ | 9,000 | | | $ | 265 | | | $ | 929 | | | $ | - | | | $ | 10,194 | |
| Expenditures for segment assets | | | 5,659 | | | | 800 | | | | 993 | | | | - | | | | 7,452 | |
|
| Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Product and Service, Revenue [Table Text Block] |
| | | | | | | | | | | Elimination of | | | | | |
| | | Manufacturing | | | Distribution | | | Intercompany Sales | | | Total | |
| Industrial | | $ | 11,355 | | | $ | 856 | | | $ | (996 | ) | | $ | 11,215 | |
| Land-based transmissions | | | 20,027 | | | | 4,337 | | | | (2,649 | ) | | | 21,715 | |
| Marine and propulsion systems | | | 52,146 | | | | 22,489 | | | | (15,488 | ) | | | 59,147 | |
| Other | | | - | | | | 4,962 | | | | (345 | ) | | | 4,617 | |
| Total | | $ | 83,528 | | | $ | 32,644 | | | $ | (19,478 | ) | | $ | 96,694 | |
| | | | | | | | | | | Elimination of | | | | | |
| | | Manufacturing | | | Distribution | | | Intercompany Sales | | | Total | |
| Industrial | | $ | 9,679 | | | $ | 1,400 | | | $ | (1,345 | ) | | $ | 9,734 | |
| Land-based transmissions | | | 17,220 | | | | 3,878 | | | | (3,322 | ) | | | 17,776 | |
| Marine and propulsion systems | | | 45,536 | | | | 20,176 | | | | (16,414 | ) | | | 49,298 | |
| Other | | | 49 | | | | 4,684 | | | | (299 | ) | | | 4,434 | |
| Total | | $ | 72,484 | | | $ | 30,138 | | | $ | (21,380 | ) | | $ | 81,242 | |
| | | | | | | | | | | Elimination of | | | | | |
| | | Manufacturing | | | Distribution | | | Intercompany Sales | | | Total | |
| Industrial | | $ | 33,313 | | | $ | 2,951 | | | $ | (3,131 | ) | | $ | 33,133 | |
| Land-based transmissions | | | 55,618 | | | | 9,705 | | | | (8,586 | ) | | | 56,737 | |
| Marine and propulsion systems | | | 150,739 | | | | 52,845 | | | | (39,505 | ) | | | 164,079 | |
| Other | | | - | | | | 14,280 | | | | (1,359 | ) | | | 12,921 | |
| Total | | $ | 239,670 | | | $ | 79,781 | | | $ | (52,581 | ) | | $ | 266,870 | |
| | | | | | | | | | | Elimination of | | | | | |
| | | Manufacturing | | | Distribution | | | Intercompany Sales | | | Total | |
| Industrial | | $ | 27,810 | | | $ | 3,506 | | | $ | (2,951 | ) | | $ | 28,365 | |
| Land-based transmissions | | | 53,967 | | | | 9,541 | | | | (9,438 | ) | | | 54,070 | |
| Marine and propulsion systems | | | 130,443 | | | | 69,485 | | | | (50,503 | ) | | | 149,425 | |
| Other | | | 45 | | | | 12,916 | | | | (761 | ) | | | 12,200 | |
| Total | | $ | 212,265 | | | $ | 95,448 | | | $ | (63,653 | ) | | $ | 244,060 | |
|