Condensed Consolidated Statements of Operations - Unaudited - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 43,326,080	$ 28,033,521	$ 144,951,427	$ 77,194,500
Costs and expenses
Costs of goods sold	41,395,596	26,308,987	132,883,924	72,426,245
General, selling and administrative costs	1,054,100	999,220	3,836,279	2,962,139
Interest expense	1,792	8,451	17,545	8,451
Costs and expenses, total	42,451,488	27,316,658	136,737,748	75,396,835
Interest and other income	(6,275)	(4,375)	(75,325)	(13,125)
Earnings before income taxes	880,867	721,238	8,289,004	1,810,790
Provision for (benefit from) income taxes:
Current	282,365	63,510	2,097,540	79,150
Deferred	(66,271)	496,457	(74,118)	810,705
Income tax	216,094	559,967	2,023,422	889,855
Net earnings	$ 664,773	$ 161,271	$ 6,265,582	$ 920,935
Weighted average number of common shares outstanding:
Basic (in shares)	7,009,444	7,009,444	7,009,444	7,009,444
Diluted (in shares)	7,009,444	7,009,444	7,009,444	7,009,444
Net earnings per share:
Basic (in dollars per share)	$ 0.09	$ 0.02	$ 0.89	$ 0.13
Diluted (in dollars per share)	0.09	0.02	0.89	0.13
Cash dividends declared per common share (in dollars per share)	$ 0.06	$ 0.01	$ 0.15	$ 0.03