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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
May 31, 2019
May 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net earnings $ 1,363,600 $ 1,816,600
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:    
Depreciation 366,200 352,800
Deferred income taxes, net (51,800) 188,100
Provision for doubtful accounts 103,500 85,000
Provision for inventory valuation allowance 117,300 92,100
Share-based compensation expense 166,300 0
Changes in assets and liabilities:    
Accounts receivable 79,700 56,400
Inventories (160,600) (1,243,600)
Prepaid expenses and other assets 460,600 299,800
Accounts payable (2,184,900) 1,366,700
Accrued salaries and commissions, and other liabilities (957,900) (482,200)
Deferred revenues (576,700) (250,600)
Income taxes payable 435,100 486,400
Total adjustments (2,203,200) 950,900
Net cash provided by (used in) operating activities (839,600) 2,767,500
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (129,300) (804,100)
Net cash used in investing activities (129,300) (804,100)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on long-term debt (237,800) (251,300)
Cash received from sale of treasury stock 122,400 25,100
Cash used to purchase treasury stock (302,500) (29,600)
Dividends paid (410,100) 0
Net cash used in financing activities (828,000) (255,800)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (1,796,900) 1,707,600
CASH AND CASH EQUIVALENTS - BEGINNING OF PERIOD 3,199,300 2,723,300
CASH AND CASH EQUIVALENTS - END OF PERIOD 1,402,400 4,430,900
SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION:    
Cash paid for interest 232,000 229,300
Cash paid for income taxes (net of refunds) 100,200 (6,100)
NON-CASH TRANSACTIONS    
Accrued capital expenditures $ 0 $ 33,300