Note 8 - Leases - Lease Cost and Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Operating lease right-of-use assets	$ 1,190	$ 1,190
Operating lease liabilities	1,190	1,190
Operating lease cost	80	146
Short-term lease expense	$ 15	$ 31
Weighted-average remaining lease term for operating leases (in years) (Year)	11 years 36 days	11 years 36 days
Weighted-average discount rate for operating leases	2.74%	2.74%