Note 7 - Operating Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Operating Lease, Right-of-Use Asset	$ 4,728	$ 4,728	$ 2,875
Operating Lease, Liability, Total	$ 5,194	$ 5,194
Operating Lease, Weighted Average Discount Rate, Percent	3.90%	3.90%
Operating Lease, Weighted Average Remaining Lease Term (Year)	5 years 146 days	5 years 146 days
Operating Lease, Expense	$ 257	$ 564