Note 11 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Lease, Weighted Average Remaining Lease Term (Month)	29 months	30 months
Operating Lease, Weighted Average Discount Rate, Percent	2.30%	2.10%
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	$ 88,000
Operating Lease, Payments	504,000	591,000
Other Operating Income (Expense) [Member]
Operating Lease, Cost	3,700,000	3,000,000.0
Short-term Lease, Cost	$ 3,200,000	$ 2,400,000
Minimum [Member]
Lessee, Operating Lease, Renewal Term (Month)	6 months
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Month)	3 years