Note 12 - Operating Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Weighted Average Discount Rate, Percent	7.80%	8.20%
Operating Lease, Cost	$ 1,800	$ 2,000	$ 2,100
Operating Lease, Payments	1,500	$ 1,500	$ 1,700
Lessee, Operating Lease, Liability, to be Paid, Total	$ 7,698
First Lease [Member]
Lessee, Operating Lease, Term of Contract (Year)	125 months
Second Lease [Member]
Lessee, Operating Lease, Term of Contract (Year)	60 months
Third Lease [Member]
Lessee, Operating Lease, Term of Contract (Year)	87 months
Three Operating Leases [Member]
Lessee, Operating Lease, Liability, to be Paid, Total	$ 7,100
Minimum [Member]
Lessee, Operating Lease, Term of Contract (Year)	1 year
Lessee, Operating Lease, Renewal Term (Year)	1 year
Operating Lease, Weighted Average Discount Rate, Percent	6.10%
Maximum [Member]
Lessee, Operating Lease, Term of Contract (Year)	10 years
Lessee, Operating Lease, Renewal Term (Year)	6 years
Operating Lease, Weighted Average Discount Rate, Percent	8.50%