Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Valuation allowance		$ 12,067,000	$ 16,569,000	$ 15,000,000
Provision or benefit for income taxes		(242,000)		$ 7,351,000
Federal net operating loss carryforwards		30,200,000
Deferred tax asset		$ 242,000
Federal tax rate		34.00%	34.00%	34.00%
Deferred tax asset		$ 200,000
Refundable credits		300,000
Decrease in deferred tax asset		5,300,000
Accounting Standards Update 2016-09 [Member]
Income Taxes [Line Items]
Increase to retained earnings		$ 687,000
Scenario, Plan [Member]
Income Taxes [Line Items]
Federal tax rate	21.00%
Minimum [Member]
Income Taxes [Line Items]
Federal net operating loss carryforwards expiration between, years		Dec. 31, 2019
Maximum [Member]
Income Taxes [Line Items]
Federal net operating loss carryforwards expiration between, years		Dec. 31, 2036