v3.26.3
Schedule of segment data (Details) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 31, 2026
Aug. 31, 2025
Aug. 31, 2026
Aug. 31, 2025
Segment Reporting [Line Items]        
Net Sales $ 5,232,153 $ 5,162,696 $ 10,893,312 $ 10,295,469
Gross profit 2,766,855 2,589,737 5,980,775 5,254,251
Research & product development 679,160 627,278 1,296,143 1,295,748
Marketing and selling 1,000,747 871,353 2,025,731 1,729,504
General and administrative 705,417 669,952 1,380,209 1,324,477
Total Operating Expenses 2,385,324 2,168,583 4,702,083 4,349,729
Operating Income 381,531 421,154 1,278,692 904,522
Income Before Taxes 498,034 526,209 1,483,547 1,129,752
Income Tax Expense 131,740 102,516 376,085 221,074
Net Income 366,294 423,693 1,107,462 908,678
Operating Segment [Member]        
Segment Reporting [Line Items]        
Net Sales 5,232,000 5,163,000 10,893,000 10,295,000
Direct cost of goods sold materials & freight 1,937,000 1,990,000 3,824,000 3,861,000
Direct cost of goods sold production labor 102,000 76,000 212,000 151,000
Direct cost of goods sold depreciation 68,000 52,000 102,000 102,000
Direct cost of goods sold other 94,000 92,000 227,000 210,000
Direct cost of goods sold 2,201,000 2,210,000 4,365,000 4,324,000
Service department salaries 141,000 139,000 287,000 278,000
Service department travel 40,000 38,000 92,000 75,000
Service department outside installations (9,000) 148,000 (47,000) 160,000
Service department warranty costs 15,000 (19,000) 50,000 78,000
Service department other 77,000 57,000 165,000 126,000
Service department 264,000 363,000 547,000 717,000
Total cost of goods & service 2,465,000 2,573,000 4,912,000 5,041,000
Gross profit 2,767,000 2,590,000 5,981,000 5,254,000
Research & product development salaries 485,000 476,000 943,000 950,000
Research & product development insurance 38,000 31,000 73,000 66,000
Research & product development depreciation 33,000 46,000 65,000 91,000
Research & product development r & d materials 63,000 36,000 102,000 102,000
Research & product development other 60,000 38,000 113,000 87,000
Research & product development 679,000 627,000 1,296,000 1,296,000
Marketing and selling salaries 514,000 456,000 1,014,000 902,000
Marketing and selling insurance 64,000 53,000 126,000 100,000
Marketing and selling commissions 200,000 175,000 426,000 328,000
Marketing and selling travel & entertainment 28,000 31,000 57,000 60,000
Marketing and selling salaries advertising trade show 114,000 93,000 230,000 201,000
Marketing and selling salaries depreciation 23,000 26,000 45,000 51,000
Marketing and selling salaries other 59,000 37,000 128,000 88,000
Marketing and selling 1,002,000 871,000 2,026,000 1,730,000
General and administrative salaries 277,000 284,000 572,000 555,000
General and administrative insurance 55,000 47,000 110,000 92,000
General and administrative professional fees 98,000 85,000 204,000 169,000
General and administrative corporate expenses 130,000 124,000 221,000 255,000
General and administrative stock based compensation 88,000 71,000 173,000 146,000
General and administrative depreciation 15,000 19,000 30,000 36,000
General and administrative depreciation misc other 41,000 41,000 70,000 71,000
General and administrative 704,000 671,000 1,380,000 1,324,000
Total Operating Expenses 2,385,000 2,169,000 4,702,000 4,350,000
Operating Income 382,000 421,000 1,279,000 904,000
Interest Income & Unrealized Gain 117,000 105,000 204,000 225,000
Income Before Taxes 498,000 526,000 1,483,000 1,129,000
Income Tax Expense 132,000 102,000 376,000 221,000
Net Income $ 366,000 $ 424,000 $ 1,107,000 $ 908,000