Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 2,598,743	$ 4,557,167
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	5,319,562	3,889,742
Amortization of debt issuance costs	14,698	27,578
Right of use asset amortization	1,874,117	0
Deferred income taxes	1,138,701	252,716
Gain on sale of property and equipment	(32,067)	(65,217)
Other losses	1,724	1,656
Changes in operating assets and liabilities
Accounts receivable and accrued billings	(243,815)	(2,851,504)
Costs and estimated earnings in excess of billings on uncompleted contracts	(3,240,062)	(4,337,328)
Residential properties under construction	7,671,759	(2,406,320)
Real estate inventory	(1,026,968)	(983,700)
Income taxes receivable	(234,111)	619,552
Prepaid expenses and other assets	(65,920)	1,532,110
Land and land development costs	62,158	(670,034)
Income taxes payable	0	276,201
Accounts payable and accrued liabilities	(427,817)	1,942,156
Operating lease liabilities	(1,923,843)	0
Billings in excess of costs and estimated earnings on uncompleted contracts	71,495	74,540
Accrued remediation costs	(15,541)	(19,389)
Net cash provided by operating activities	11,542,813	1,839,926
Cash flows from investing activities
Proceeds from disposal of property and equipment	253,789	147,200
Purchases of property, buildings and equipment	(14,335,772)	(7,577,091)
Net cash used in investing activities	(14,081,983)	(7,429,891)
Cash flows from financing activities
Purchases of treasury stock	(161,285)	0
Proceeds from notes payable	15,500,000	2,816,961
Repayments on notes payable	(8,588,000)	(5,810,000)
Other long-term debt repayments	(56,097)	(52,917)
Debt issuance costs	(57,883)	(23,313)
Net cash provided by (used in) financing activities	6,636,735	(3,069,269)
Net increase (decrease) in cash, cash equivalents and restricted cash	4,097,565	(8,659,234)
Cash, cash equivalents and restricted cash at beginning of the period	11,402,353	18,631,784
Cash, cash equivalents and restricted cash at end of the period	15,499,918	9,972,550
Supplemental disclosure of cash flow information
Interest paid, net of amounts capitalized	735,292	367,870
Income taxes paid, net	405,000	767,182
Supplemental disclosure of non-cash investing
Liability for equipment acquired	224,166	203,149
Equipment funded by other long-term debt	241,502	352,083
Right-of-use asset obtained in exchange for operating lease obligations	$ 3,490,319	$ 0