Income Taxes (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) item	Dec. 31, 2020 USD ($)
Income Tax Disclosure [Line Items]
Effective tax rate
Number of CARES Act provisions company is able to benefit from | item	1
Expected refund for AMT credit carryforward	$ 212,000
Valuation allowance	30,414,000	$ 33,892,000
Net operating loss carryforwards	105,077,000
Research and development tax credit carryforwards	2,237,000	2,450,000
Unrecognized tax benefits	0	0
Unrecognized tax benefits, interest and penalties	0	$ 0
Indefinite [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	16,400,000
Tax Year 2000 [Member] | Expired [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	13,800,000
Tax Year 2001 [Member] | Expired [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 14,400,000