Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Warranty reserves	$ 1,944	$ 1,848
Amortizable intangible assets	1,127
Stock based compensation	3,055	1,629
Accrued compensation and other	5,075	574
Inventories, additional costs capitalized for tax	7,281	7,844
Deferred tax asset	18,482	11,895
Prepaid expenses	1,133	148
Property and equipment	3,586	4,276
Amortizable intangible assets		1,280
Accrued expenses		636
Deferred tax liabiliy	4,719	6,340
Net deferred tax asset	$ 13,763	$ 5,555