Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net earnings	$ 3,599,893	$ 364,330
Adjustments to reconcile net earnings to cash provided by (used in) operating activities:
Depreciation	357,596	282,064
Deferred taxes	96,164	144,961
Compensation expense for restricted stock	72,240	72,240
Change in postretirement benefits	7,430	1,720
Decrease (increase) in operating assets:
Accounts receivable	(789,499)	680,046
Inventories	(14,269,173)	(4,777,078)
Other current assets	(106,821)	96,747
Increase (decrease) in operating liabilities:
Accounts payable and accrued expenses	9,391,535	5,745,306
Income taxes payable	862,259
Contribution to retirement plan	45,000	42,000
Employee compensation and related expenses	313,262	24,143
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(420,114)	2,676,479
INVESTING ACTIVITIES
Purchase of property, plant and equipment	(187,223)	(159,465)
Increase in cash surrender value of officers’ life insurance	(6,275)	(4,375)
NET CASH USED IN INVESTING ACTIVITIES	(193,498)	(163,840)
FINANCING ACTIVITIES
Cash dividends paid	(140,189)	(70,094)
NET CASH USED IN FINANCING ACTIVITIES	(140,189)	(70,094)
INCREASE (DECREASE) IN CASH	(753,801)	2,442,545
Cash at beginning of period	4,052,582	1,461,695
CASH AT END OF PERIOD	$ 3,298,781	$ 3,904,240