Income Taxes (Reconciliation of income tax) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Tax expense at U.S. statutory rates									$ (290,000)	$ 3,976,000	$ 4,017,000
State tax expense (benefit), net of federal benefit									235,000	1,079,000	1,134,000
Other, net									760,000	365,000	549,000
Total Income Tax Provision	$ 2,680,000	$ 1,130,000	$ (3,805,000)	$ 700,000	$ 1,560,000	$ 1,460,000	$ 1,850,000	$ 550,000	$ 705,000	$ 5,420,000	$ 5,700,000