Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Cash Flows From Operating Activities
Net income	$ 8,068	$ 2,987	$ 1,858	$ 1,844	$ 11,055	$ 3,702
Adjustments to reconcile net income to net cash provided by operating activities:
Stock based compensation	340		1,112		1,020	2,626
Bad debt expense					149	148
Depreciation and amortization of property and equipment					3,213	3,428
Amortization of intangible assets					2,095	1,907
Amortization of debt discount					85	175
Non-cash lease expense					107
Loss on sale of property and equipment	6				8	2
Changes in operating assets and liabilities:
Receivables					(14,040)	(3,295)
Inventories					71,326	49,049
Prepaid expenses and other					(167)	(90)
Income tax receivable/payable					3,770	2,399
Other assets					(95)	103
Accounts payable, accrued expenses and other current liabilities					6,977	(1,107)
Operating lease liability					(1,893)
Total Adjustments					72,555	55,345
Net Cash Provided By Operating Activities					83,610	59,047
Cash Flows From Investing Activities
Cash paid for acquisitions					(2,749)
Proceeds from sales of property and equipment					4,963	20
Purchases of property and equipment					(2,979)	(5,919)
Net Cash Used In Investing Activities					(765)	(5,899)
Cash Flows From Financing Activities
Net repayments under M&T bank floor plan					(63,057)	(48,893)
Borrowings under Houston mortgage with M&T bank and PPP Loans					13,710
Repayment of long term debt with M&T bank					(725)	(1,450)
Proceeds from financing liability						3,476
Repayments of financing liability					(480)	(341)
Payment of dividends on Series A preferred stock						(1,210)
Repurchase of Unit Purchase Options						(500)
Repurchase of Treasury Stock					(184)
Proceeds from shares issued pursuant to the Employee Stock Purchase Plan					150
Repayments of acquisition notes payable					(1,536)	(681)
Loan issuance costs					(131)
Net Cash Used In Financing Activities					(52,253)	(49,599)
Net Increase In Cash					30,592	3,549
Cash - Beginning		$ 31,458		$ 26,603	31,458	26,603	$ 26,603
Cash - Ending	$ 62,050		$ 30,152		62,050	30,152	$ 31,458
Supplemental Disclosures of Cash Flow Information:
Cash paid during the period for interest					4,710	5,488
Cash paid during the period for income taxes net of refunds received					66	886
Non-Cash Investing and Financing Activities
Rental vehicles transferred to inventory, net						218
Fixed assets purchased with accounts payable
Accrued dividends on Series A Preferred Stock					3,328	2,709
Operating lease assets - ASC 842 adoption					(17,781)
Operating lease liabilities - ASC 842 adoption					17,845
Operating lease assets - new					(655)
Operating lease liabilities - new					655
Net assets acquired in acquisitions					$ 2,749