Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Percentage of dividends-received-deduction for foreign-source dividends received from 10%-or-more owned foreign corporations		100.00%
Minimum ownership percentage in foreign corporations for foreign-source dividends deduction		10.00%
Benefit from eliminating previously recorded deferred tax liability for undistributed earnings		$ 2,700,000
Need for valuation allowance based on history of cumulative losses	3 years
Percentage of change in corporate income tax rate due to write-down of deferred tax assets		21.00%
Net UTB classsified as current liability	$ 334,000
Increase (decrease) in valuation allowance	(49,000)	$ 520,000
Research & Development tax credits	4,200,000
Deferred tax assets, operating loss carryforwards, domestic	5,800,000
Cash payments for income taxes, net of refunds received	$ 29,000	$ 40,000