Condensed Consolidated Statements of Cash flows (USD $)	6 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES
Net earnings	$ 647,405	$ 836,018
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	887,700	913,800
Provision for deferred taxes	(64,965)	(125,991)
Provision for postretirement benefits	38,416	34,954
Decrease (increase) in operating assets:
Accounts receivable, net	1,283,980	1,509,086
Inventories	(4,757,516)	(278,444)
Other	(227,666)	(254,311)
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	(1,781,826)	(3,301,269)
Contribution to profit-sharing plan	105,000	105,000
Employee compensation and related expenses	166,201	(141,669)
Income taxes payable	79,109
Deferred credit for LIFO inventory replacement		32,213
NET CASH USED IN OPERATING ACTIVITIES	(3,624,162)	(670,613)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(3,926,719)	(153,019)
Increase in cash surrender value of officers' life insurance	(30,500)	(31,000)
NET CASH USED IN INVESTING ACTIVITIES	(3,957,219)	(184,019)
FINANCING ACTIVITIES
Cash dividends paid	(271,978)	(1,087,912)
NET CASH USED IN FINANCING ACTIVITIES	(271,978)	(1,087,912)
DECREASE IN CASH	(7,853,359)	(1,942,544)
Cash at beginning of period	15,081,024	15,923,294
CASH AT END OF PERIOD	$ 7,227,665	$ 13,980,750