Note 8 - Leases - Lease Cost and Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Operating lease right-of-use assets	$ 1,120	$ 1,120
Operating lease liabilities	1,120	1,120
Operating lease cost	70	216
Short-term lease expense	$ 14	$ 45
Weighted-average remaining lease term for operating leases (in years) (Year)	10 years 292 days	10 years 292 days
Weighted-average discount rate for operating leases	2.75%	2.75%