Income Taxes (Schedule of Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets - current:
Net operating loss carryforwards	$ 744	$ 620	$ 3,501
Windfall tax benefit carryforwards	(744)	(620)	(580)
Federal/State credit carryforwards	2,692	2,536	2,260
Depreciation and amortization	146	24	$ 6
Stock compensation	650	326
Accrued liabilities and allowances	1,098	1,508	$ 1,532
Unrecognized tax benefits	(738)	(704)	(683)
Net deferred tax assets	$ 3,848	$ 3,690	$ 6,036