Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)	6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
OPERATING ACTIVITIES
Net earnings	$ 332,655	$ 647,405
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:
Depreciation	855,900	887,700
Provision for deferred taxes	71,156	(64,965)
Provision for postretirement benefits	46,343	38,416
Decrease (increase) in operating assets:
Accounts receivable, net	(326,624)	1,283,980
Inventories	433,698	(4,757,516)
Other	(196,695)	(227,666)
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	(322,361)	(1,781,826)
Contribution to profit-sharing plan	102,000	105,000
Employee compensation and related expenses	$ 1,274	166,201
Income taxes payable		79,109
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	$ 997,346	(3,624,162)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(1,321,185)	(3,926,719)
Increase in cash surrender value of officers’ life insurance	(34,500)	(30,500)
NET CASH USED IN INVESTING ACTIVITIES	(1,355,685)	(3,957,219)
FINANCING ACTIVITIES
Cash dividends paid	(135,989)	(271,978)
NET CASH USED IN FINANCING ACTIVITIES	(135,989)	(271,978)
DECREASE IN CASH	(494,328)	(7,853,359)
Cash at beginning of period	2,225,924	15,081,024
CASH AT END OF PERIOD	$ 1,731,596	$ 7,227,665