Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal and state tax carryforwards	$ 8,331	$ 12,894
Inventory	787	549
Share-based compensation	1,909	2,186
Receivables	239	194
Accrued liabilities	836	349
Other	5	32
Total deferred tax assets	12,107	16,204
Property, plant and equipment	22,951	24,970
Other	637	839
Total deferred tax liabilities	23,588	25,809
Total noncurrent deferred income taxes	$ 11,481	$ 9,605