Note 8 - Operating Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 1,416	$ 1,416
Operating Lease, Weighted Average Discount Rate, Percent	4.10%	4.10%
Operating Lease, Weighted Average Remaining Lease Term	2 years	2 years
Operating Lease, Expense	$ 300	$ 500
Operating Lease, Liability, Total	$ 1,416	$ 1,416