Condensed Consolidated Statements of Operations - Unaudited - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net sales	$ 26,077,710	$ 18,317,506	$ 49,160,979	$ 40,711,270
Costs and expenses
Costs of goods sold	24,700,540	18,363,217	46,520,386	42,009,969
General, selling and administrative costs	924,525	915,829	1,962,919	2,008,579
Costs and expenses, total	25,625,065	19,279,046	48,483,305	44,018,548
Interest and other income	(4,375)	(14,750)	(8,750)	(29,500)
Earnings (loss) before income taxes	457,020	(946,790)	686,424	(3,277,778)
Provision for (benefit from) income taxes:
Current		154,995		(673,618)
Deferred	146,981	(497,903)	205,765	(539,059)
Income tax	146,981	(342,908)	205,765	(1,212,677)
Net earnings (loss)	$ 310,039	$ (603,882)	$ 480,659	$ (2,065,101)
Weighted average number of common shares outstanding:
Basic (in shares)	7,009,444	6,799,444	7,009,444	6,799,444
Diluted (in shares)	7,009,444	6,799,444	7,009,444	6,799,444
Net earnings (loss) per share:
Basic (in dollars per share)	$ 0.04	$ (0.09)	$ 0.07	$ (0.30)
Earnings Per Share, Diluted	0.04	(0.09)	0.07	(0.30)
Cash dividends declared per common share (in dollars per share)	$ 0.01	$ 0.01	$ 0.02	$ 0.02