Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Abstract]
Warranty reserves	$ 928	$ 983
Amortizable intangible assets	113	678
Stock based compensation	2,105	1,513
Accrued compensation and other	845
Inventories, additional costs capitalized for tax		41
Deferred tax asset	3,991	3,215
Prepaid expenses	191	514
Property and equipment	2,023	1,420
Accrued expenses	3,057	1,556
Inventories, additional costs capitalized for tax	502
Deferred tax liabiliy	5,773	3,490
Net deferred tax liability	$ (1,782)	$ (275)