Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Net operating loss carryforwards	$ 21	$ 26
Allowance for doubtful accounts	81	53
Amortization - intangibles	4	0
Charitable contributions	43	0
Accrued liabilities	7	0
Accrued vacation	76	78
Deferred buy-back asset	1,776	1,645
Deferred income	304	198
Right-of-use asset	91	0
Other	83	76
Gross deferred tax assets	2,486	2,076
Deferred tax liabilities:
Retainage	(518)	(425)
Deferred buy-back obligation	(1,421)	(1,324)
Fixed assets	(2,236)	(1,667)
Prepaids	(104)	(78)
Unrealized gain loss	(2)	(9)
Lease liability	(91)	0
Gross deferred tax liabilities	(4,372)	(3,503)
Valuation allowance	0	0
Net deferred tax liability	$ (1,886)	$ (1,427)