Note 5 - Leases - Additional Information Regarding Financing and Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Amortization of ROU assets, finance lease	$ 97	$ 102
Interest on lease liabilities, finance lease	14	8
Operating lease expense	1,157	1,159
Short term lease expense	250	273
Financing cash flows	109	113
Operating cash flows	1,140	1,236
Finance leases		452
Operating leases	$ 332	$ 2,404