Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
OPERATING ACTIVITIES
Net earnings	$ 836,018	$ 3,736,183
Adjustments to reconcile net earnings to cash provided by operating activities:
Depreciation	913,800	900,598
Provision for deferred taxes	(125,991)	(48,583)
Provision for postretirement benefits	34,954	44,706
Decrease (increase) in operating assets:
Accounts receivable, net	1,509,086	7,982,837
Inventories	(278,444)	2,540,748
Other	(254,311)	(209,892)
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	(3,301,269)	(4,224,595)
Contribution to profit-sharing plan	105,000	105,000
Employee compensation and related expenses	(141,669)	(34,853)
Income taxes payable		(98,464)
Deferred credit for LIFO inventory replacement	32,213
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(670,613)	10,693,685
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(153,019)	(135,196)
Proceeds from sales of assets		42,375
Increase in cash surrender value of officers' life insurance	(31,000)	(31,000)
NET CASH USED IN INVESTING ACTIVITIES	(184,019)	(123,821)
FINANCING ACTIVITIES
Cash dividends paid	(1,087,912)	(1,767,855)
NET CASH USED IN FINANCING ACTIVITIES	(1,087,912)	(1,767,855)
INCREASE (DECREASE) IN CASH	(1,942,544)	8,802,009
Cash at beginning of period	15,923,294	11,881,548
CASH AT END OF PERIOD	$ 13,980,750	$ 20,683,557