Condensed Consolidated Statements of Operations - Unaudited - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Net sales	$ 18,548,247	$ 23,552,636	$ 65,682,520	$ 83,001,633
Costs and expenses
Costs of goods sold	17,080,958	22,293,839	61,165,635	78,279,846
General, selling and administrative costs	1,099,682	976,330	3,665,974	3,407,757
Costs and expenses, total	18,180,640	23,270,169	64,831,609	81,687,603
Interest and other income	(328,560)	(15,250)	(363,060)	(45,784)
Earnings before income taxes	696,167	297,717	1,213,971	1,359,814
Provision for (benefit from) income taxes:
Current	175,469	137,591	289,462	617,247
Deferred	35,578	(27,517)	106,734	(92,482)
Income tax expense (benefit), total	211,047	110,074	396,196	524,765
Net earnings	$ 485,120	$ 187,643	$ 817,775	$ 835,049
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 per share:
Basic (in dollars per share)	$ 0.07	$ 0.03	$ 0.12	$ 0.12
Diluted (in dollars per share)	0.07	0.03	0.12	0.12
Cash dividends declared per common share (in dollars per share)	$ 0.01	$ 0.02	$ 0.03	$ 0.06