Note 5 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating leases	$ 318	$ 469
Short-term leases	48	83
Total lease cost	$ 366	$ 552
Weighted-average remaining lease term (in years) (Year)	5 years 3 months 18 days
Weighted-average discount rate	3.30%