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Schedule of segment data (Details) - USD ($)
 12 Months Ended
Feb. 28, 2025
Feb. 29, 2024
Segment Reporting Information [Line Items]    
Net Sales $ 20,504,381 $ 19,699,886
Gross Profit 9,739,019 9,844,575
Research & Product Development 2,724,482 2,885,773
Marketing and Selling 3,677,915 3,695,870
General and Administrative 2,326,582 2,080,447
Total Operating Expenses 8,728,979 8,662,090
Operating Income 1,010,040 1,182,485
Income Before Taxes 1,534,092 1,744,580
Income Tax Expense 260,678 303,117
Net Income 1,273,414 1,441,463
Operating Segment [Member]    
Segment Reporting Information [Line Items]    
Net Sales 20,504,000 19,700,000
Materials & Freight 8,126,000 7,669,000
Production Labor 817,000 435,000
Other 645,000 590,000
Direct Cost of Goods Sold 9,588,000 8,694,000
Salaries 560,000 496,000
Travel 218,000 216,000
Outside Installations 42,000 139,000
Warranty Costs 121,000 77,000
Other 236,000 233,000
Service Department 1,177,000 1,161,000
Total Cost of Goods & Service 10,765,000 9,855,000
Gross Profit 9,739,000 9,845,000
Salaries 1,879,000 2,011,000
Insurance 167,000 163,000
Depreciation 231,000 210,000
R & D Materials 233,000 310,000
Other 214,000 192,000
Research & Product Development 2,724,000 2,886,000
Salaries 1,809,000 2,098,000
Commissions 767,000 674,000
Insurance 196,000 174,000
Travel & Entertainment 157,000 134,000
Advertising / Trade Show 438,000 371,000
Depreciation 87,000 54,000
Other 224,000 191,000
Marketing and Selling 3,678,000 3,696,000
Salaries and Wages 1,051,000 824,000
Insurance 183,000 158,000
Depreciation and Amortization 76,000 62,000
Professional Fees 384,000 280,000
Corporate Expenses 361,000 353,000
Stock Based Compensation 248,000 204,000
Misc Other 24,000 200,000
General and Administrative 2,327,000 2,081,000
Total Operating Expenses 8,729,000 8,662,000
Operating Income 1,010,000 1,182,000
Interest Income & Unrealized Gain 524,000 562,000
Income Before Taxes 1,534,000 1,744,000
Income Tax Expense 261,000 303,000
Net Income $ 1,273,000 $ 1,441,000