Note 5 - Leases (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Operating Lease, Right-of-Use Asset	$ 6,292		$ 6,292		$ 3,719
Lessee, Operating Lease, Lease Not yet Commenced, Future Lease Obligations	4,200		4,200
Operating Lease, Lease Income, Lease Payments	700	$ 500	1,700	$ 1,300
Other Assets [Member]
Operating Lease, Right-of-Use Asset	6,300		6,300		3,700
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 5,800		$ 5,800		$ 3,100
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Year)	2 years		2 years
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year)	5 years		5 years
Lessor, Operating Lease, Remaining Lease Term (Year)			5 years
Lessor, Operating Lease, Renewal Term (Year)	5 years		5 years
Minimum [Member]
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract (Year)	2 years		2 years
Lessor, Operating Lease, Remaining Lease Term (Year)			1 year