Income Taxes, Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Effective income tax rate reconciliation [Abstract]
Statutory federal income tax benefit	$ 3,802	$ 3,578
State tax benefit, net of federal taxes	46	45
Foreign tax	1	(2)
Foreign deferred exchange rate adjustments	(59)	(1,112)
Nondeductible/nontaxable items	(272)	(259)
Other	(113)	(72)
Valuation allowance increase	(3,413)	(2,184)
Total income tax expense	$ (8)	$ (6)