Condensed Consolidated Statements of Operations - Unaudited - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales	$ 53,432,029	$ 26,077,710	$ 101,625,347	$ 49,160,979
Costs and expenses
Costs of goods sold	49,487,488	24,577,299	91,488,328	46,117,258
General, selling and administrative costs	1,289,438	924,525	2,782,178	1,962,919
Interest expense	15,753		15,753
Costs and expenses, total	50,792,679	25,501,824	94,286,259	48,080,177
Interest and other income	(6,275)	(4,375)	(69,050)	(8,750)
Earnings before income taxes	2,645,625	580,261	7,408,138	1,089,552
Provision for (benefit from) income taxes:
Current	748,719	15,640	1,815,175	15,640
Deferred	(104,010)	169,287	(7,846)	314,248
Income tax	644,709	184,927	1,807,329	329,888
Net earnings	$ 2,000,916	$ 395,334	$ 5,600,809	$ 759,664
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)	$ 0.29	$ 0.05	$ 0.80	$ 0.11
Diluted (in dollars per share)	0.29	0.05	0.80	0.11
Cash dividends declared per common share (in dollars per share)	$ 0.06	$ 0.01	$ 0.09	$ 0.02