Note 4 - Operating Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating lease expense	$ 295	$ 323
Financing lease expense	8	0
Short Term lease expense	21	29
Total lease expense	$ 324	$ 352
Weighted Average Remaining Lease Term (Years) - operating leases (Year)	8 years 10 months 13 days	9 years 9 months 21 days
Weighted Average Remaining Lease Term (Years) - financing leases (Year)	3 years 6 months 25 days
Weighted Average Discount Rate - operating leases	3.17%	3.17%
Weighted Average Discount Rate - financing leases	5.00%	0.00%
Operating cash flows from operating leases	$ 318	$ 332
Operating cash flows from financing lease	1	0
Financing cash flows from financing lease	4	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 261	$ 0