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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
 6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES: $ 171,700 $ 46,900
CASH FLOWS FROM INVESTING ACTIVITIES:    
Investment in nonmarketable equity securites (129,400)  
Purchases of property, plant and equipment (16,500) (61,000)
Net cash used in investing activities (145,900) (61,000)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash paid to acquire treasury stock (49,100) (214,300)
Cash received from sales of treasury stock 110,800 107,600
Borrowings under revolving credit agreement 725,000  
Payments under revolving credit agreement (200,000)  
Dividends paid (939,600) (935,400)
Net cash used in financing activities (352,900) (1,042,100)
NET DECREASE IN CASH AND CASH EQUIVALENTS (327,100) (1,056,200)
CASH AND CASH EQUIVALENTS—BEGINNING OF PERIOD 760,100 1,988,200
CASH AND CASH EQUIVALENTS—END OF PERIOD 433,000 932,000
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 7,200  
Cash paid for income taxes $ 344,100 $ 346,000