Note 7 - Leases - Lease Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating lease expense	$ 5,094
Cash paid for leases	4,585
Right of use assets obtained in exchange for lease obligations	$ 27,639
Weighted average remaining lease term (years) (Year)	8 years 6 months 7 days
Weighted average discount rate	3.90%