Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2003
Commitments and Contingencies
Operating Lease, Right-of-Use Asset	$ 6,900,000
Operating Lease, Liability	6,997,000
Operating Lease, Payments	1,682,000
Lease, Cost	$ 1,801,000	$ 1,603,000	$ 1,558,000
Option to extend	true
Operating Lease, Weighted Average Remaining Lease Term	6 years 7 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	4.60%
Contingent cash payment				$ 1,000,000