Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net earnings (loss)	$ 525,949	$ (118,250)
Adjustments to reconcile net earnings (loss) to cash provided by (used in) operating activities:
Depreciation	427,950	443,849
Deferred taxes	35,578	(37,448)
Change in postretirement benefits	23,171	19,208
Decrease (increase) in operating assets:
Accounts receivable	1,244,504	1,240,793
Inventories	680,834	(3,624,589)
Other current assets	126,456	100,189
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	(778,408)	(1,643,532)
Income taxes payable	62,974
Contribution to profit sharing plan	51,000	52,500
Employee compensation and related expenses	118,971	(52,815)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	2,518,979	(3,620,095)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(835,230)	(521,512)
Increase in cash surrender value of officers' life insurance	(17,250)	(15,250)
NET CASH USED IN INVESTING ACTIVITIES	(852,480)	(536,762)
FINANCING ACTIVITIES
Cash dividends paid	(67,994)	(135,989)
NET CASH USED IN FINANCING ACTIVITIES	(67,994)	(135,989)
INCREASE (DECREASE) IN CASH	1,598,505	(4,292,846)
Cash at beginning of period	2,225,924	15,081,024
CASH AT END OF PERIOD	$ 3,824,429	$ 10,788,178