Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Stock-based compensation	$ 392	$ 408
Basis in partnerships	8,163	9,212
Inventory	2,585	2,316
Accrued expenses	2,979	2,206
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Contingencies	1,385	1,444
Deferred Tax Assets, Operating Leases Liabilities	601	832
Other	349	191
Deferred tax assets, gross	16,454	16,609
Deferred tax assets, net	16,454	16,609
Deferred Tax Liabilities, Leasing Arrangements	(581)	(818)
Deferred tax liabilities:
Prepaid insurance	(372)	(419)
Other	(125)	(110)
Deferred tax liabilities	(1,078)	(1,347)
Deferred Tax Assets, Valuation Allowance	$ 0	$ 0	$ 1,063