Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Federal and state tax carryforwards	$ 7,659	$ 8,331
Inventory	970	787
Share-based compensation	2,029	1,909
Receivables	166	239
Accrued liabilities	333	836
Other	7	5
Total deferred tax assets	11,164	12,107
Property, plant and equipment	21,312	22,951
Other	814	637
Total deferred tax liabilities	22,126	23,588
Total noncurrent deferred income taxes	$ 10,962	$ 11,481