Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Deferred Tax Assets Tax Deferred Compensation Noncurrent	$ 1,270,000				$ 1,063,000				$ 1,270,000	$ 1,063,000
Income tax expense (benefit)	1,230,000	$ 1,375,000	$ 1,325,000	$ 330,000	2,680,000	$ 1,130,000	$ (3,805,000)	$ 700,000	4,260,000	705,000	$ 5,420,000
Income Tax Examination, Penalties and Interest Accrued	0				0				0	0
Effective income tax rate reconciliation related to impairment losses, tax benefit									(1,400,000)
Effective income tax rate reconciliation related to executive compensation									1,000,000.0
Income Tax Examination, Penalties and Interest Expense									0	600	$ 2,100
Deferred tax asset, valuation allowance	0				0				0	0
Unrecognized tax benefits, income tax penalties accrued	$ 0				$ 0				$ 0	$ 0
Effective income tax rate reconciliation, percent									27.60%	(58.40%)