Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Tax expense (benefit) at statutory rate	$ 345	$ (1,340)	$ 1,211
Nondeductible executive compensation	778	320	145
Foreign income taxes	425	(250)	364
Foreign deferred items	365
Net operating losses	355
Foreign interest disallowance	292
Nondeductible entertainment expenses	201	206	258
Valuation allowance change	153	719	54
Prior year provision to return adjustments	43
State income taxes, net of federal benefit	(108)	(8)	212
Impact of Tax Cuts and Job Act	(155)	(238)	(255)
Unrealized income on investments	(203)	(337)	(163)
Net change in uncertain tax positions	(360)	(154)	(67)
Research and development credit	(400)	(557)	(525)
Equity compensation	(1,921)	(2,081)	(2,664)
Nondeductible transaction costs			1,676
Federal tax rate differential			(100)
Foreign tax credit			(133)
Domestic production activities deduction			(174)
Other	114	169	18
Income tax (benefit) expense	$ (76)	$ (3,551)	$ (143)