Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities
Net income (loss)	$ 857,201	$ (89,777)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	225,046	189,128
Gain on disposal of fixed assets	(12,711)	(5,868)
Allowance for doubtful accounts	(153,215)	(26,484)
Stock compensation	151,032	0
Deferred taxes	175,000	65,000
(Increase) decrease in
Accounts receivable - billed	1,547,054	(466,818)
Accounts receivable - unbilled	(92,118)	(541,181)
Inventories	(1,216,234)	(116,958)
Prepaid expenses and other assets	(97,959)	(103,138)
Prepaid income taxes	251,115	(139,870)
Accounts payable - trade	(352,264)	125,850
Accrued expenses and other	(43,477)	383,594
Accrued compensation	(260,112)	259,919
Accrued income taxes payable	60,619	0
Customer deposits	471,753	(248,123)
Net cash provided by (used in) operating activities	1,510,730	(714,726)
Cash flows from investing activities:
Purchases of investment securities available-for-sale	(8,750)	(8,842)
Purchases of property and equipment	(674,316)	(967,378)
Proceeds from sale of fixed assets	18,065	5,868
Net cash used in investing activities	(665,001)	(970,352)
Cash flows from financing activities:
Proceeds from long-term borrowings	183,784	465,131
Repayments of long-term borrowings	(141,317)	(92,659)
Dividends paid on common stock	(49,414)	0
Proceeds from options exercised	62,248	0
Net cash provided by financing activities	55,301	372,472
Net increase (decrease) in cash and cash equivalents	901,030	(1,312,606)
Cash and cash equivalents
Beginning of period	3,522,620	1,735,621
End of period	$ 4,423,650	$ 423,015