Note 8 - Leases - Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Right-of-use lease asset	$ 3,654		$ 3,654
Lease liability	$ 4,062		$ 4,062
Weighted Average Remaining Lease Term (Year)	5 years 262 days		5 years 262 days
Weighted Average Discount Rate	2.95%		2.95%
Operating lease expense	$ 212	$ 189	$ 611	$ 568
Cash paid for operating leases	$ 229	$ 213	$ 661	$ 632