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STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net earnings $ 2,860,900 $ 2,119,300
Adjustments to reconcile net earnings to net cash provided by (used in) operating activities:    
Impairment of asset 1,082,300 0
Depreciation 1,079,000 274,500
Deferred income taxes 221,100 (19,100)
Provision for doubtful accounts and sales returns 283,200 1,239,600
Provision for inventory valuation allowance (25,000) (68,100)
Changes in assets and liabilities:    
Accounts receivable (686,900) (676,200)
Inventories, net (16,771,700) (6,048,600)
Prepaid expenses and other assets 533,500 (672,500)
Accounts payable, accrued salaries and commissions, and other current liabilities 11,427,000 6,837,000
Deferred revenue (2,292,100) 2,925,200
Income tax payable 716,300 739,500
Total adjustments (4,433,300) 4,531,300
Net cash provided by (used in) operating activities (1,572,400) 6,650,600
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (2,485,400) (24,911,600)
Net cash used in investing activities (2,485,400) (24,911,600)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments—long-term debt (738,500) (97,200)
Proceeds from long-term debt 4,000,000 18,400,000
Cash received from sale of treasury stock 227,800 202,500
Cash paid to acquire treasury stock (200) (1,600)
Net borrowings under line of credit 1,551,100 1,931,800
Dividends paid (1,466,900) (1,374,700)
Net cash provided by financing activities 3,573,300 19,060,800
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (484,500) 799,800
CASH AND CASH EQUIVALENTS—BEGINNING OF YEAR 1,183,700 383,900
CASH AND CASH EQUIVALENTS—END OF YEAR 699,200 1,183,700
SUPPLEMENTAL DISCLOSURE OF CASH FLOWS INFORMATION:    
Cash paid for interest 1,005,200 179,800
Cash paid for income taxes $ 543,800 $ 706,400