Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 28,150,817	$ 43,326,080	$ 109,121,717	$ 144,951,427
Costs and expenses
Costs of goods sold	28,097,884	41,395,596	108,380,110	132,883,924
General, selling and administrative costs	1,200,393	1,054,100	3,662,630	3,836,279
Interest expense	2,463	1,792	2,463	17,545
Costs and expenses, total	29,300,740	42,451,488	112,045,203	136,737,748
Interest and other income	(4,370)	(6,275)	(15,075)	(75,325)
Earnings (loss) before income taxes	(1,145,553)	880,867	(2,908,411)	8,289,004
Provision for (benefit from) income taxes:
Current	244,940	282,365	(49,584)	2,097,540
Deferred	(509,490)	(66,271)	(628,459)	(74,118)
Income tax	(264,550)	216,094	(678,043)	2,023,422
Net earnings (loss)	$ (881,003)	$ 664,773	$ (2,230,368)	$ 6,265,582
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)	$ (0.13)	$ 0.09	$ (0.32)	$ 0.89
Diluted (in dollars per share)	(0.13)	0.09	(0.32)	0.89
Cash dividends declared per common share (in dollars per share)	$ 0.02	$ 0.06	$ 0.08	$ 0.15