CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 792,688	$ 991,385
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	351,422	353,488
Amortization of debt issue costs	37,038	90,049
Stock based compensation expense	150,697	22,910
Change in contract losses	29,139	(40,532)
Deferred income taxes	507,376	0
Changes in operating assets and liabilities:
Accounts receivable	(305,150)	1,118,019
Costs on uncompleted contracts, in excess of progress billings	(1,116,108)	240,431
Inventories - raw materials	(58,995)	3,005
Other current assets	(124,537)	152,051
Other noncurrent assets and liabilities	(9,678)	(819)
Accounts payable	15,010	(406,463)
Accrued expenses	88,319	(170,369)
Accrued taxes	0	20,958
Billings on uncompleted contracts, in excess of related costs	184,742	(945,358)
Net cash provided by operating activities	541,963	1,428,755
CASH FLOWS FROM INVESTING ACTIVITIES
Proceeds from sale of equipment	80,000	0
Deposit for fixed assets	(36,987)	0
Purchases of property, plant and equipment	(808,386)	(114,856)
Net cash used in investing activities	(765,373)	(114,856)
CASH FLOWS FROM FINANCING ACTIVITIES
Deferred loan costs	0	(145,995)
Borrowings of long-term debt	0	3,011,648
Repayment of long-term debt	(352,509)	(2,673,432)
Net cash (used in) provided by financing activities	(352,509)	192,221
Effect of exchange rate on cash and cash equivalents	(611)	42
Net (decrease) increase in cash and cash equivalents	(576,530)	1,506,162
Cash and cash equivalents, beginning of period	3,066,156	1,332,166
Cash and cash equivalents, end of period	2,489,626	2,838,328
Cash paid during the period for:
Interest	185,415	479,179
Income taxes	$ 30,000	$ 20,000