Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 39,995,580	$ 53,432,029	$ 80,970,900	$ 101,625,347
Costs and expenses
Costs of goods sold	40,778,230	49,487,488	80,282,226	91,488,328
General, selling and administrative costs	1,253,849	1,289,438	2,462,237	2,782,178
Interest expense		15,753		15,753
Costs and expenses, total	42,032,079	50,792,679	82,744,463	94,286,259
Interest and other income	(4,370)	(6,275)	(10,705)	(69,050)
Earnings (loss) before income taxes	(2,032,129)	2,645,625	(1,762,858)	7,408,138
Provision for (benefit from) income taxes:
Current	(385,062)	748,719	(294,524)	1,815,175
Deferred	(102,930)	(104,010)	(118,969)	(7,846)
Income tax	(487,992)	644,709	(413,493)	1,807,329
Net earnings (loss)	$ (1,544,137)	$ 2,000,916	$ (1,349,365)	$ 5,600,809
Weighted average number of common shares outstanding:
Basic (in shares)	6,999,444	7,009,444	6,999,444	7,009,444
Diluted (in shares)	6,999,444	7,009,444	6,999,444	7,009,444
Net earnings (loss) per share:
Basic (in dollars per share)	$ (0.22)	$ 0.29	$ (0.19)	$ 0.80
Diluted (in dollars per share)	(0.22)	0.29	(0.19)	0.80
Cash dividends declared per common share (in dollars per share)	$ 0.02	$ 0.06	$ 0.06	$ 0.09