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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 9 Months Ended
Nov. 30, 2018
Nov. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net earnings $ 6,122,900 $ 4,390,600
Adjustments to reconcile net earnings to net cash provided by operating activities:    
Depreciation 1,085,100 911,700
Deferred income taxes, net 673,100 179,400
Provision for doubtful accounts 68,500 (210,700)
Provision for inventory valuation allowance 246,200 78,400
Share-based compensation expense 255,300 0
Changes in assets and liabilities:    
Accounts receivable (705,000) (709,500)
Inventories, net (4,441,700) 9,807,100
Prepaid expenses and other assets (324,400) (198,700)
Accounts payable 3,327,000 (7,301,700)
Accrued salaries and commissions, and other liabilities 2,384,300 3,889,200
Deferred revenues 364,300 28,600
Income taxes payable (1,252,900) 469,600
Total adjustments 1,679,800 6,943,400
Net cash provided by operating activities 7,802,700 11,334,000
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (1,360,500) (1,330,500)
Net cash used in investing activities (1,360,500) (1,330,500)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on long-term debt (702,100) (657,800)
Proceeds from long-term debt 0 1,019,000
Cash received from sale of treasury stock 227,100 32,000
Cash received from issuance of shares 0 26,300
Cash used to purchase treasury stock (31,900) (98,000)
Net borrowings under line of credit 0 (4,882,900)
Dividends paid (818,100) 0
Net cash used in financing activities (1,325,000) (4,561,400)
NET INCREASE IN CASH AND CASH EQUIVALENTS 5,117,200 5,442,100
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 2,723,300 699,200
CASH AND CASH EQUIVALENTS - END OF PERIOD 7,840,500 6,141,300
SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION:    
Cash paid for interest 704,300 868,900
Cash paid for income taxes $ 2,859,100 $ 2,058,100