Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)	3 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net earnings (loss)	$ 170,620	$ (1,461,219)
Adjustments to reconcile net earnings (loss) to cash provided by (used in) operating activities:
Depreciation	282,064	401,999
Deferred taxes	58,784	(41,156)
Compensation expense for restricted stock	72,240
Change in postretirement benefits	1,720	14,420
Decrease (increase) in operating assets:
Accounts receivable	680,046	(2,525,312)
Inventories	(4,497,191)	2,079,596
Federal income taxes recoverable		(1,068,338)
Other current assets	96,747	118,106
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	5,745,306	704,630
Contribution to retirement plan	42,000	43,500
Employee compensation and related expenses	24,143	36,288
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	2,676,479	(1,697,486)
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(159,465)	(198,688)
Increase in cash surrender value of officers’ life insurance	(4,375)	(14,750)
NET CASH USED IN INVESTING ACTIVITIES	(163,840)	(213,438)
FINANCING ACTIVITIES
Cash dividends paid	(70,094)	(67,994)
NET CASH USED IN FINANCING ACTIVITIES	(70,094)	(67,994)
INCREASE (DECREASE) IN CASH	2,442,545	(1,978,918)
Cash at beginning of period	1,461,695	2,796,762
CASH AT END OF PERIOD	$ 3,904,240	$ 817,844