CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 345,100	$ 792,688
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	372,060	351,422
Amortization of debt issue costs	29,846	37,038
Stock based compensation expense	96,518	150,697
Change in contract loss provision	15,255	29,139
Deferred income taxes	142,403	507,376
Changes in operating assets and liabilities:
Accounts receivable	629,238	(305,150)
Inventories	(1,142,803)	(1,175,103)
Contract assets	(3,501,075)	0
Other current assets	19,924	(124,537)
Other noncurrent assets and liabilities	0	(9,678)
Accounts payable	685,733	15,010
Accrued expenses	121,343	88,319
Contract liabilities	1,503,079	184,742
Net cash (used in) provided by operating activities	(683,379)	541,963
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property, plant and equipment	(228,148)	(808,386)
Deposit for fixed assets	0	(36,987)
Proceeds from sale of equipment	0	80,000
Net cash used in investing activities	(228,148)	(765,373)
CASH FLOWS FROM FINANCING ACTIVITIES
Repayment of long-term debt	(377,323)	(352,509)
Net cash used in financing activities	(377,323)	(352,509)
Effect of exchange rate on cash and cash equivalents	978	(611)
Net decrease in cash and cash equivalents	(1,287,872)	(576,530)
Cash and cash equivalents, beginning of period	2,689,110	3,066,156
Cash and cash equivalents, end of period	1,401,238	2,489,626
Cash paid during the year for:
Interest expense	155,787	185,415
Income taxes	$ 0	$ 30,000

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