v3.25.4
Schedule of segment data (Details) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2025
Nov. 30, 2024
Nov. 30, 2025
Nov. 30, 2024
Segment Reporting Information [Line Items]        
Net Sales $ 5,004,370 $ 5,190,596 $ 15,299,839 $ 15,383,416
Gross profit 2,512,241 2,343,199 7,766,492 7,313,783
Research & product development 638,361 627,543 1,934,109 2,054,846
Marketing and selling 927,300 929,196 2,656,804 2,814,804
General and administrative 627,608 588,823 1,952,085 1,722,210
Total Operating Expenses 2,193,269 2,145,562 6,542,998 6,591,860
Operating Income 318,972 197,637 1,223,494 721,923
Income Before Taxes 426,801 313,990 1,556,553 1,119,947
Income Tax Expense 86,842 39,812 307,916 174,247
Net Income 339,959 274,178 1,248,637 945,700
Operating Segment [Member]        
Segment Reporting Information [Line Items]        
Net Sales 5,004,000 5,191,000 15,300,000 15,383,000
Direct cost of goods sold materials & freight 1,930,000 2,125,000 5,792,000 6,034,000
Direct cost of goods sold production labor 191,000 232,000 341,000 650,000
Direct cost of goods sold depreciation 52,000 65,000 154,000 183,000
Direct cost of goods sold other 84,000 92,000 295,000 294,000
Direct cost of goods sold 2,257,000 2,514,000 6,582,000 7,161,000
Service department salaries 127,000 140,000 404,000 415,000
Service department travel 51,000 52,000 126,000 176,000
Service department outside installations (25,000) 42,000 135,000 36,000
Service department warranty costs 14,000 33,000 92,000 103,000
Service department other 68,000 66,000 195,000 179,000
Service department 235,000 333,000 952,000 909,000
Total cost of goods & service 2,492,000 2,847,000 7,534,000 8,070,000
Gross profit 2,512,000 2,344,000 7,766,000 7,313,000
Research & product development salaries 456,000 435,000 1,407,000 1,414,000
Research & product development insurance 30,000 40,000 96,000 125,000
Research & product development depreciation 82,000 54,000 173,000 171,000
Research & product development r & d materials 34,000 48,000 136,000 182,000
Research & product development other 36,000 51,000 122,000 163,000
Research & product development 638,000 628,000 1,934,000 2,055,000
Marketing and selling salaries 449,000 440,000 1,351,000 1,342,000
Marketing and selling Insurance 56,000 46,000 157,000 145,000
Marketing and selling commissions 148,000 222,000 476,000 628,000
Marketing and selling travel & entertainment 31,000 47,000 91,000 143,000
Marketing and selling salaries advertising trade show 153,000 92,000 353,000 327,000
Marketing and selling salaries depreciation 26,000 38,000 77,000 72,000
Marketing and selling salaries other 64,000 44,000 152,000 158,000
Marketing and selling 927,000 929,000 2,657,000 2,815,000
General and administrative salaries 282,000 253,000 838,000 779,000
General and administrative insurance 48,000 45,000 140,000 132,000
General and administrative professional fees 96,000 87,000 264,000 289,000
General and administrative corporate expenses 85,000 78,000 340,000 311,000
General and administrative stock based compensation 86,000 79,000 232,000 176,000
General and administrative depreciation 19,000 21,000 54,000 57,000
General and administrative depreciation misc other 11,000 26,000 84,000 (23,000)
General and administrative 627,000 589,000 1,952,000 1,721,000
Total Operating Expenses 2,192,000 2,146,000 6,543,000 6,591,000
Operating Income 320,000 198,000 1,223,000 722,000
Interest Income & Unrealized Gain 107,000 116,000 333,000 398,000
Income Before Taxes 427,000 314,000 1,556,000 1,120,000
Income Tax Expense 87,000 40,000 308,000 174,000
Net Income $ 340,000 $ 274,000 $ 1,248,000 $ 946,000