Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of net income (loss) to net cash provided by operating activities
Net income	$ 1,044,304	$ (804,838)
Adjustments to reconcile net income (loss) to net cash provided by operating activities
Depreciation and amortization	667,900	636,644
Gain (loss) on sale of fixed assets	(17,381)	174
Deferred taxes	(32,000)	67,000
(Increase) decrease in
Accounts receivable - billed	(2,702,291)	3,203,868
Accounts receivable - unbilled	43,272	(198,776)
Inventories	(767,740)	212,934
Refundable income taxes	339,128	(722,948)
Prepaid expenses and other assets	(81,718)	164,660
Increase (decrease) in
Accounts payable - trade	591,439	(365,115)
Accrued expenses and other liabilities	435,236	(388,278)
Accrued compensation	7,072	38,805
Accrued income taxes payable	0	(302,264)
Customer deposits	491,669	(115,515)
Net cash provided by operating activities	18,890	1,426,351
Cash Flows From Investing Activities
Purchases of investment securities available-for-sale	(31,575)	(78,453)
Purchases of property and equipment	(1,635,317)	(465,826)
Proceeds from sale of fixed assets	18,015	46,230
Net cash absorbed by investing activities	(1,648,877)	(498,049)
Cash Flows From Financing Activities
Borrowings from the line-of-credit	352,022	0
Proceeds from long-term borrowings	97,005	55,159
Repayments of long-term borrowings	(530,820)	(372,880)
Dividends paid on common stock	(194,345)	(174,239)
Proceeds from options exercised	69,341	0
Net cash absorbed by financing activities	(206,797)	(491,960)
Net increase (decrease) in cash and cash equivalents	(1,836,784)	436,342
Cash and cash equivalents
Beginning of period	3,572,405	3,136,063
End of period	1,735,621	3,572,405
Supplemental schedule of non-cash investing activities
Cash Payments for interest	103,086	116,229
Cash Payments for income taxes	$ 679,427	$ 48,609