CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($)	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 106,358	$ (390,014)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:
Depreciation	521,422	548,038
Amortization of debt issue costs	45,099	31,280
Stock based compensation expense	146,417	81,667
Change in contract loss provision	(175,365)	216,039
Deferred income taxes	60,573	(115,092)
Changes in operating assets and liabilities:
Accounts receivable	(183,076)	257,459
Contract assets	(810,032)	(271,767)
Inventories	19,129	589,904
Other current assets	164,127	(296,328)
Other noncurrent assets	38,092	(9,419)
Accounts payable	325,369	(138,463)
Accrued expenses	(101,028)	18,282
Contract liabilities	(496,691)	87,815
Net cash (used in) provided by operating activities	(339,606)	609,401
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(546,890)	(35,225)
Net cash used in investing activities	(546,890)	(35,225)
CASH FLOWS FROM FINANCING ACTIVITIES
Debt issue costs	(24,610)	(32,209)
Proceeds from payroll protection program loan	1,317,100	0
Proceeds from revolver loan	1,000,000	0
Repayment of revolver loan	(1,000,000)	0
Repayment of long-term debt	(81,352)	(610,515)
Net cash provided by (used in) financing activities	1,211,138	(642,724)
Effect of exchange rate on cash and cash equivalents	(178)	307
Net increase (decrease) in cash and cash equivalents	324,464	(68,241)
Cash and cash equivalents, beginning of period	930,856	2,036,646
Cash and cash equivalents, end of period	$ 1,255,320	$ 1,968,405