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CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)
 3 Months Ended
May 31, 2012
May 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES: $ 1,017,500 $ 427,000
CASH FLOWS FROM INVESTING ACTIVITIES:    
Investment in nonmarketable equity securites (82,800)  
Purchases of property, plant and equipment (16,500)  
Net cash used in investing activities (99,300)  
CASH FLOWS FROM FINANCING ACTIVITIES:    
Cash paid to acquire treasury stock (49,100) (154,200)
Cash received from sales of treasury stock 55,100 51,600
Dividends paid (469,600) (468,700)
Net cash used in financing activities (463,600) (571,300)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 454,600 (144,300)
CASH AND CASH EQUIVALENTS—BEGINNING OF PERIOD 760,100 1,988,200
CASH AND CASH EQUIVALENTS—END OF PERIOD 1,214,700 1,843,900
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 2,600  
Cash paid for income taxes $ 84,100 $ 81,000