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Schedule of segment data (Details) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 31, 2025
Aug. 31, 2024
Aug. 31, 2025
Aug. 31, 2024
Segment Reporting Information [Line Items]        
Net Sales $ 5,162,696 $ 5,161,782 $ 10,295,469 $ 10,192,820
Gross profit 2,589,737 2,516,097 5,254,251 4,970,584
Research & product development 627,278 695,873 1,295,748 1,427,303
Marketing and selling salaries other 871,353 988,418 1,729,504 1,885,608
General and administrative 669,952 545,816 1,324,477 1,133,387
Total Operating Expenses 2,168,583 2,230,107 4,349,729 4,446,298
Operating Income 421,154 285,990 904,522 524,286
Income Before Taxes 526,209 414,646 1,129,752 805,957
Income Tax Expense 102,516 73,961 221,074 134,435
Net Income 423,693 340,685 908,678 671,522
Operating Segment [Member]        
Segment Reporting Information [Line Items]        
Net Sales 5,163,000 5,162,000 10,295,000 10,193,000
Direct cost of goods sold materials & freight 1,990,000 1,958,000 3,861,000 3,909,000
Production Labor 76,000 261,000 151,000 418,000
Depreciation 52,000 60,000 102,000 118,000
Other 92,000 89,000 210,000 201,000
Direct cost of goods sold 2,210,000 2,368,000 4,324,000 4,646,000
Salaries 139,000 137,000 278,000 275,000
Travel 38,000 60,000 75,000 124,000
Outside Installations 148,000 20,000 160,000 (6,000)
Warranty costs (19,000) 12,000 78,000 70,000
Other 57,000 49,000 126,000 113,000
Service department 363,000 278,000 717,000 576,000
Total cost of goods & service 2,573,000 2,646,000 5,041,000 5,222,000
Gross profit 2,590,000 2,516,000 5,254,000 4,971,000
Salaries 476,000 472,000 950,000 978,000
Insurance 31,000 40,000 66,000 86,000
Depreciation 46,000 64,000 91,000 116,000
R & D Materials 36,000 60,000 102,000 133,000
Other 38,000 60,000 87,000 114,000
Research & product development 627,000 696,000 1,296,000 1,427,000
Marketing and selling salaries 456,000 463,000 902,000 902,000
Marketing and selling Insurance 53,000 50,000 100,000 99,000
Marketing and selling commissions 175,000 211,000 328,000 407,000
Marketing and selling travel & entertainment 31,000 56,000 60,000 96,000
Marketing and selling salaries advertising trade show 93,000 128,000 201,000 234,000
Marketing and selling salaries depreciation 26,000 18,000 51,000 33,000
Marketing and selling salaries other 37,000 62,000 88,000 115,000
Marketing and selling salaries other 871,000 988,000 1,730,000 1,886,000
General and administrative salaries 284,000 278,000 555,000 526,000
General and administrative insurance 47,000 44,000 92,000 87,000
General and administrative professional fees 85,000 94,000 169,000 203,000
General and administrative corporate expenses 124,000 118,000 255,000 233,000
General and administrative stock based compensation 71,000 43,000 146,000 97,000
General and administrative depreciation 19,000 19,000 36,000 36,000
General and administrative depreciation misc other 41,000 (50,000) 71,000 (49,000)
General and administrative 671,000 546,000 1,324,000 1,133,000
Total Operating Expenses 2,169,000 2,230,000 4,350,000 4,446,000
Operating Income 421,000 286,000 904,000 525,000
Interest Income & Unrealized (Loss)/Gain 105,000 129,000 225,000 282,000
Income Before Taxes 526,000 415,000 1,129,000 807,000
Income Tax Expense 102,000 74,000 221,000 135,000
Net Income $ 424,000 $ 341,000 $ 908,000 $ 672,000