v3.26.1
Schedule of segment data (Details) - USD ($)
 3 Months Ended
May 31, 2026
May 31, 2025
Segment Reporting [Line Items]    
Net Sales $ 5,661,159 $ 5,132,773
Gross profit 3,213,918 2,664,514
Research & product development 616,982 668,470
Marketing and selling 1,024,984 858,151
General and administrative 674,792 654,525
Total Operating Expenses 2,316,758 2,181,146
Operating Income 897,160 483,368
Income Before Taxes 985,513 603,543
Income Tax Expense 244,345 118,558
Net Income 741,168 484,985
Operating Segment [Member]    
Segment Reporting [Line Items]    
Net Sales 5,661,000 5,133,000
Direct cost of goods sold materials & freight 1,887,000 1,872,000
Direct cost of goods sold production labor 111,000 76,000
Direct cost of goods sold depreciation 34,000 50,000
Direct cost of goods sold other 133,000 119,000
Direct cost of goods sold 2,165,000 2,117,000
Service department salaries 146,000 138,000
Service department travel 51,000 37,000
Service department outside installations 11,000
Service department warranty costs 35,000 98,000
Service department other 50,000 67,000
Service department 282,000 351,000
Total cost of goods & service 2,447,000 2,468,000
Gross profit 3,214,000 2,665,000
Research & product development salaries 458,000 474,000
Research & product development insurance 35,000 35,000
Research & product development depreciation 32,000 45,000
Research & product development r & d materials 39,000 66,000
Research & product development other 53,000 48,000
Research & product development 617,000 668,000
Marketing and selling salaries 500,000 437,000
Marketing and selling Insurance 61,000 47,000
Marketing and selling commissions 227,000 152,000
Marketing and selling travel & entertainment 29,000 29,000
Marketing and selling salaries advertising trade show 117,000 108,000
Marketing and selling salaries depreciation 22,000 25,000
Marketing and selling salaries other 69,000 60,000
Marketing and selling 1,025,000 858,000
General and administrative salaries 294,000 272,000
General and administrative insurance 56,000 45,000
General and administrative professional fees 105,000 84,000
General and administrative corporate expenses 90,000 132,000
General and administrative stock based compensation 86,000 75,000
General and administrative depreciation 15,000 17,000
General and administrative depreciation misc other 29,000 30,000
General and administrative 675,000 655,000
Total Operating Expenses 2,317,000 2,181,000
Operating Income 897,000 484,000
Interest Income & Unrealized Gain 88,000 120,000
Income Before Taxes 985,000 604,000
Income Tax Expense 244,000 119,000
Net Income $ 741,000 $ 485,000