Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
OPERATING ACTIVITIES
Net earnings	$ 3,736,183	$ 4,146,319
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	900,598	916,200
Provision for deferred taxes	(48,583)	(45,350)
Provision for postretirement benefits	44,706	38,098
Decrease (increase) in operating assets:
Accounts receivable, net	7,982,837	321,522
Inventories	2,540,748	8,419,817
Other	(209,892)	(155,823)
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	(4,224,595)	930,223
Contribution to profit-sharing plan	105,000	100,200
Employee compensation and related expenses	(34,853)	(154,343)
Income taxes payable	(98,464)	(291,811)
NET CASH PROVIDED BY OPERATING ACTIVITIES	10,693,685	14,225,052
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(135,196)	(208,488)
Proceeds from sales of assets	42,375
Increase in cash surrender value of officers' life insurance	(31,000)	(30,500)
NET CASH USED IN INVESTING ACTIVITIES	(123,821)	(238,988)
FINANCING ACTIVITIES
Cash dividends paid	(1,767,855)	(1,631,867)
NET CASH USED IN FINANCING ACTIVITIES	(1,767,855)	(1,631,867)
INCREASE IN CASH	8,802,009	12,354,197
Cash at beginning of period	11,881,548	7,210,290
CASH AT END OF PERIOD	$ 20,683,557	$ 19,564,487