Note 8 - Leases - Lease Cost and Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Operating lease right-of-use assets	$ 1,214
Operating lease liabilities	1,214
Operating lease cost	66
Short-term lease expense	$ 16
Weighted-average remaining lease term for operating leases (Year)	11 years 109 days
Weighted-average discount rate for operating leases	2.73%