Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Unrecognized tax benefits current	$ 10,000
Need for valuation allowance based on history of cumulative losses	3 years
Increase (decrease) in valuation allowance	$ 122,000	$ (49,000)
Research & Development tax credits	4,100,000
Deferred tax assets, operating loss carryforwards, domestic	1,300,000
Cash payments for income taxes, net of refunds received	$ 46,000	$ 29,000