Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of net income to net cash provided by operating activities
Net income	$ 2,835,200	$ 1,044,304
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	821,042	667,900
Gain on sale of fixed assets	(32,140)	(17,381)
Deferred taxes	574,000	(32,000)
(Increase) decrease in
Accounts receivable - billed	(363,583)	(2,594,357)
Accounts receivable - unbilled	(73,259)	43,272
Allowance for doubtful accounts	(28,832)	(107,934)
Inventories	(84,533)	(767,740)
Refundable income taxes	132,705	339,128
Prepaid expenses and other assets	(116,369)	(81,718)
Increase (decrease) in
Accounts payable - trade	395,815	591,439
Accrued expenses and other liabilities	(6,115)	435,236
Accrued compensation	433,026	7,072
Customer deposits	(492,463)	491,669
Net cash provided by operating activities	3,994,494	18,890
Cash Flows From Investing Activities
Purchases of investment securities available-for-sale	(23,987)	(31,575)
Purchases of property and equipment	(3,744,520)	(1,635,317)
Proceeds from sale of fixed assets	57,802	18,015
Net cash absorbed by investing activities	(3,710,705)	(1,648,877)
Cash Flows From Financing Activities
Proceeds from the line-of-credit	1,450,000	352,022
Repayments on the line-of-credit	(1,802,022)	0
Proceeds from long-term borrowings	2,233,481	97,005
Repayments of long-term borrowings	(460,818)	(530,820)
Dividends paid on common stock	0	(194,345)
Proceeds from options exercised	82,569	69,341
Net cash provided by or (absorbed) by financing activities	1,503,210	(206,797)
Net increase (decrease) in cash and cash equivalents	1,786,999	(1,836,784)
Cash and cash equivalents
Cash and cash equivalents, beginning of year	1,735,621	3,572,405
Cash and cash equivalents, end of year	$ 3,522,620	1,735,621	$ 3,572,405
Supplemental schedule of non-cash investing activities
Cash payments for interest		162,529	103,086
Cash payments for income taxes		$ 769,983	$ 679,427