CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income	$ (341,569)	$ 1,100,676
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation	717,579	749,755
Amortization of debt issue costs	59,502	55,247
Loss on disposal of equipment		3,428
Stock based compensation expense	90,917	137,352
Change in contract loss provision	227,688	(143,105)
Deferred income taxes	(73,041)	423,357
Provision for claims settlement	495,000
Changes in operating assets and liabilities:
Accounts receivable	20,143	436,539
Inventories	22,702	(263,622)
Contract assets	(113,789)	(2,334,418)
Other current assets	(146,185)	13,322
Other noncurrent assets		(7,245)
Accounts payable	(424,017)	263,377
Accrued expenses	77,747	246,501
Contract liabilities	64,102	(149,855)
Net cash provided by operating activities	676,779	531,309
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(39,831)	(446,652)
Proceeds from disposition of equipment		35,309
Net cash used in investing activities	(39,831)	(411,343)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from stock transactions	9,051	182,400
Common stock repurchased	0	(188,600)
Deferred loan costs	(41,628)
Repayment of finance lease obligation	(10,951)	(14,002)
Repayment of long-term debt	(1,699,549)	(752,352)
Net cash used in financing activities	(1,743,077)	(772,554)
Effect of exchange rate on cash and cash equivalents	339	124
Net decrease in cash and cash equivalents	(1,105,790)	(652,464)
Cash and cash equivalents, beginning of period	2,036,646	2,689,110
Cash and cash equivalents, end of period	930,856	2,036,646
Cash paid during the year for:
Interest	$ 232,492	$ 292,678