Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
OPERATING ACTIVITIES
Net earnings	$ 5,945,569	$ 4,953,062
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	1,377,598	1,406,700
Provision for deferred taxes	(68,025)	(40,800)
Provision for postretirement benefits	57,147	71,185
Decrease (increase) in operating assets:
Accounts receivable, net	341,565	1,515,637
Inventories	5,857,007	(7,123,023)
Other	(91,880)	(64,847)
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	1,939,048	418,539
Contribution to profit-sharing plan	150,300	156,000
Employee compensation and related expenses	(362,418)	130,943
Income taxes payable	(350,961)	31,088
Deferred credit for LIFO inventory replacement	363,623
NET CASH PROVIDED BY OPERATING ACTIVITIES	15,158,573	1,454,484
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(309,270)	(481,342)
Increase in cash surrender value of officers' life insurance	(45,750)	(42,000)
NET CASH USED IN INVESTING ACTIVITIES	(355,020)	(523,342)
FINANCING ACTIVITIES
Cash dividends paid	(2,515,794)	(4,283,650)
Principal payments on notes payable		(13,507)
NET CASH USED IN FINANCING ACTIVITIES	(2,515,794)	(4,297,157)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	12,287,759	(3,366,015)
Cash and cash equivalents at beginning of period	7,210,290	19,812,881
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 19,498,049	$ 16,446,866