Domestic And Foreign Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Domestic And Foreign Income Taxes [Abstract]
Net operating loss carry forwards and credits	$ 6,048	$ 12,043
Inventory	558	650
Compensation accruals	1,083	1,447
Accruals and reserves	108	89
Credits	387	251
Other	757	459
Total Deferred tax assets	8,941	14,939
Less: valuation allowance	(7,407)	(13,253)
Deferred tax assets net of valuation allowance	1,534	1,686
Deferred tax liabilities depreciation and amortization	(1,117)	(1,424)
Undistributed Earnings of Foreign Subsidiary		(194)
Total deferred tax liabilities	(1,117)	(1,618)
Net deferred tax	$ 417	$ 68