CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS)
Net sales	$ 15,595,558	$ 16,007,288
Cost of sales	12,131,274	12,868,086
Gross profit	3,464,284	3,139,202
Selling, general and administrative	2,841,036	2,785,486
Provision for claims settlement		495,000
Income (loss) from operations	623,248	(141,284)
Other income	4,600	22,750
Interest expense	(202,337)	(296,076)
Total other expense, net	(197,737)	(273,326)
Income (loss) before income taxes	425,511	(414,610)
Provision (benefit) for income taxes	104,880	(73,041)
Net income (loss)	320,631	(341,569)
Other comprehensive income (loss) before tax:
Foreign currency translation adjustments	150	(252)
Other comprehensive income (loss), net of tax	150	(252)
Comprehensive income (loss)	$ 320,781	$ (341,821)
Net income (loss) per share - basic	$ 0.01	$ (0.01)
Net income (loss) per share - diluted	$ 0.01	$ (0.01)
Weighted average number of shares outstanding:
Weighted average number of shares outstanding - basic	29,447,085	29,258,692
Weighted average number of shares outstanding - diluted	31,035,355	29,258,692