Note 11 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost	$ 19	$ 14	$ 0
Short-term lease cost	12	16	58
Totals	$ 31	$ 30	$ 58
Weighted-average remaining lease term (years) (Year)	3 years 3 months	4 years 3 months
Weighted-average discount rate	1.34%	1.34%
Operating cash flows from operating leases	$ 19	$ 14
Operating leases	$ 0	$ 90