Income Taxes (Details Textual) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Deferred Tax Assets Tax Deferred Compensation Noncurrent	$ 1,170,000				$ 1,087,000				$ 1,170,000	$ 1,087,000
Income Tax Expense (Benefit)	1,560,000	$ 1,460,000	$ 1,850,000	$ 550,000	1,670,000	$ 1,575,000	$ 1,795,000	$ 660,000	5,420,000	5,700,000	$ (5,920,000)
Income Tax Examination, Penalties and Interest Accrued	$ 0				$ 0				$ 0	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent									21.00%	21.00%	35.00%
Income Tax Examination, Penalties and Interest Expense									$ 2,100	$ 31,000	$ 0
Stock Option [Member]
Income Tax [Line Items]
Income Tax Expense (Benefit)									$ 0	$ 0	$ (100,000)