CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	$ 1,100,676	$ (265,908)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	749,755	704,284
Amortization of debt issue costs	55,247	70,041
Loss on disposal of equipment	3,428	20,000
Stock based compensation expense	137,352	303,175
Change in contract loss provision	(143,105)	52,197
Deferred income taxes	423,357	825,382
Changes in operating assets and liabilities:
Accounts receivable	436,539	75,794
Contract assets	(2,334,418)	0
Inventories	(263,622)	150,528
Other current assets	13,322	(28,443)
Other noncurrent assets	(7,245)	(17,742)
Accounts payable	263,377	(19,603)
Accrued expenses	246,501	(151,401)
Contract liabilities	(149,855)	(462,125)
Net cash provided by operating activities	531,309	1,256,179
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(446,652)	(994,530)
Proceeds from disposition of equipment	35,309	80,000
Net cash used in investing activities	(411,343)	(914,530)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from exercise of stock options	182,400	0
Common stock repurchased	(188,600)	0
Repayment of capital lease obligation	(14,002)	(19,940)
Repayment of long-term debt	(752,352)	(697,536)
Net cash used in financing activities	(772,554)	(717,476)
Effect of exchange rate on cash and cash equivalents	124	(1,219)
Net decrease in cash and cash equivalents	(652,464)	(377,046)
Cash and cash equivalents, beginning of period	2,689,110	3,066,156
Cash and cash equivalents, end of period	2,036,646	2,689,110
Cash paid during the year for:
Interest	292,678	343,682
Income taxes	$ 0	$ 32,227