Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 15,988,745	$ 18,548,247	$ 56,700,015	$ 65,682,520
Costs and expenses
Costs of goods sold	15,417,174	17,080,958	57,427,143	61,165,635
General, selling and administrative costs	957,305	1,099,682	2,965,884	3,665,974
Costs and expenses, total	16,374,479	18,180,640	60,393,027	64,831,609
Interest and other income	(14,755)	(328,560)	(44,255)	(363,060)
Earnings (loss) before income taxes	(370,979)	696,167	(3,648,757)	1,213,971
Provision for (benefit from) income taxes:
Current		175,469	(673,618)	289,462
Deferred	(134,354)	35,578	(673,413)	106,734
Income tax	(134,354)	211,047	(1,347,031)	396,196
Net earnings (loss)	$ (236,625)	$ 485,120	$ (2,301,726)	$ 817,775
Weighted average number of common shares outstanding:
Basic (in shares)	6,799,444	6,799,444	6,799,444	6,799,444
Diluted (in shares)	6,799,444	6,799,444	6,799,444	6,799,444
Net earnings (loss) per share:
Basic (in dollars per share)	$ (0.03)	$ 0.07	$ (0.34)	$ 0.12
Diluted (in dollars per share)	(0.03)	0.07	(0.34)	0.12
Cash dividends declared per common share (in dollars per share)	$ 0.01	$ 0.01	$ 0.03	$ 0.03