CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 320,631	$ (341,569)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	704,049	717,579
Amortization of debt issue costs	51,399	59,502
Gain on disposal of equipment	(1,425)
Stock based compensation expense	179,917	90,917
Change in contract loss provision	(121,316)	227,688
Deferred income taxes	181,065	(73,041)
Provision for claims settlement		495,000
Changes in operating assets and liabilities:
Accounts receivable	382,241	20,143
Contract assets	(1,027,787)	(113,789)
Inventories	(53,542)	22,702
Other current assets	226,714	(146,185)
Accounts payable	315,783	(424,017)
Accrued expenses	65,018	77,747
Contract liabilities	(586,897)	64,102
Net cash provided by operating activities	635,850	676,779
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(546,890)	(39,831)
Proceeds from sale of fixed assets	9,582
Deposit for fixed assets	(70,623)
Net cash used in investing activities	(607,931)	(39,831)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from stock transactions	0	9,051
Proceeds from revolver loan	1,000,000
Repayment of revolver loan	(1,000,000)
Deferred loan costs	(24,610)	(41,628)
Proceeds from payroll protection program loan	1,317,100
Repayment of long-term debt	(120,441)	(1,710,500)
Net cash provided by (used in) financing activities	1,172,049	(1,743,077)
Effect of exchange rate on cash and cash equivalents	(113)	339
Net increase (decrease) in cash and cash equivalents	1,199,855	(1,105,790)
Cash and cash equivalents, beginning of period	930,856	2,036,646
Cash and cash equivalents, end of period	2,130,711	930,856
Cash paid during the year for:
Interest	$ 135,320	$ 232,492