Note 5 - Leases (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Finance Lease, Principal Payments	$ 76	$ 93
Operating Lease, Weighted Average Remaining Lease Term (Year)	4 years 4 months 24 days
Finance Lease, Weighted Average Remaining Lease Term (Year)	3 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	3.80%
Finance Lease, Weighted Average Discount Rate, Percent	4.80%
Operating Lease, Expense	$ 900	$ 1,500