Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
OPERATING ACTIVITIES
Net earnings	$ 4,886,241	$ 5,945,569
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	1,340,697	1,377,598
Provision for deferred taxes	(69,513)	(68,025)
Provision for postretirement benefits	67,059	57,147
Decrease (increase) in operating assets:
Accounts receivable, net	9,596,924	341,565
Inventories	3,846,976	5,857,007
Other	(748,028)	(91,880)
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	(7,464,299)	1,939,048
Contribution to profit-sharing plan	157,500	150,300
Employee compensation and related expenses	(272,218)	(362,418)
Income taxes payable	(98,464)	(350,961)
Deferred credit for LIFO inventory replacement		363,623
NET CASH PROVIDED BY OPERATING ACTIVITIES	11,242,875	15,158,573
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(466,218)	(309,270)
Proceeds from sales of assets	42,375
Increase in cash surrender value of officers' life insurance	(46,500)	(45,750)
NET CASH USED IN INVESTING ACTIVITIES	(470,343)	(355,020)
FINANCING ACTIVITIES
Cash dividends paid	(6,051,505)	(2,515,794)
NET CASH USED IN FINANCING ACTIVITIES	(6,051,505)	(2,515,794)
INCREASE IN CASH	4,721,027	12,287,759
Cash at beginning of period	11,881,548	7,210,290
CASH AT END OF PERIOD	$ 16,602,575	$ 19,498,049