STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 5,767,634	$ (3,608,576)	$ 5,015,993
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	616,291	661,921	854,063
Debt issue costs	85,571	61,320
Deferred rent	(30,680)	8,235	46,017
Stock-based compensation expense	895,011	524,269	524,274
Common stock issued as employee compensation	50,782	163,451	59,423
Loss on disposal of fixed asset	21,010
Deferred income taxes	2,384,980	(2,077,299)	2,659,000
Tax benefit from stock option plans			(33,000)
Bad debt expense	150,000	460,514	50,000
Changes in operating assets and liabilities:
(Increase) decrease in accounts receivable	2,984,792	(1,309,290)	(1,249,023)
(Increase) decrease in costs and estimated earnings in excess of billings on uncompleted contracts	(11,580,025)	3,043,861	(23,568,248)
Increase in prepaid expenses and other assets	(257,706)	(1,013,008)	(237,199)
(Increase) decrease in refundable income taxes		(77,000)	8,133,433
Increase (decrease) in accounts payable and accrued expenses	1,627,689	(4,023,547)	9,446,948
(Decrease) increase in accrued losses on uncompleted contracts	(1,205,498)	827,448	153,541
Increase (decrease) in income taxes payable	103,327	(183,000)	220,822
Decrease in billings in excess of costs and estimated earnings on uncompleted contracts	(40,680)	(60,101)	(18,212)
Net cash provided by (used in) operating activities	1,572,498	(6,600,802)	2,057,832
Cash flows from investing activities:
Purchase of plant and equipment	(281,922)	(136,320)	(209,718)
Proceeds from sale of fixed asset	42,480
Net cash used in investing activities	(239,442)	(136,320)	(209,718)
Cash flows from financing activities:
Proceeds from exercise of stock options			80,000
Payment on line of credit	(4,100,000)	(30,400,000)	(9,650,000)
Proceeds from line of credit	4,500,000	29,138,685	8,200,000
Payment on long-term debt	(1,341,765)	(1,710,145)	(1,013,998)
Proceeds from long-term debt		10,000,000
Debt issue costs paid		(253,855)
Tax benefit from stock options			33,000
Net cash (used in) provided by financing activities	(941,765)	6,774,685	(2,350,998)
Net increase (decrease) in cash	391,291	37,563	(502,884)
Cash at beginning of year	1,039,586	1,002,023	1,504,907
Cash at end of year	1,430,877	1,039,586	1,002,023
Supplemental schedule of noncash investing and financing activities:
Equipment acquired under capital lease	146,192	465,475	247,881
Cashless exercise of stock options	202,500	168,750
Cash paid during the year for:
Interest	1,578,627	1,182,791	1,000,403
Income taxes	$ 144,718	$ 302,025	$ 351,275