CONDENSED STATEMENTS OF CASH FLOWS (UNAUDITED) (USD $)	9 Months Ended
	Nov. 30, 2013	Nov. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:	$ 1,752,900	$ 884,700
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in nonmarketable equity securities	0	(155,300)
Purchases of property, plant and equipment	(57,800)	(24,800)
Net cash used in investing activities	(57,800)	(180,100)
CASH FLOWS FROM FINANCING ACTIVITIES:
Cash paid to acquire treasury stock	(129,200)	(54,200)
Cash received from sales of treasury stock	130,900	165,100
Borrowings under revolving credit agreement	1,250,000	1,435,000
Payments under revolving credit agreement	(2,000,000)	(1,185,000)
Dividends paid	(954,600)	(1,411,300)
Net cash used in financing activities	(1,702,900)	(1,050,400)
NET DECREASE IN CASH AND CASH EQUIVALENTS	(7,800)	(345,800)
CASH AND CASH EQUIVALENTS—BEGINNING OF PERIOD	469,100	760,100
CASH AND CASH EQUIVALENTS—END OF PERIOD	461,300	414,300
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid for interest	33,600	18,100
Cash paid for income taxes	$ 16,700	$ 366,400