Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Operating lease assets	$ 9,594	$ 8,998	[1]
Finance lease assets	2,167	2,330
Total leased assets	11,761	11,328
Current operating lease liabilities	972	688	[1]
Current finance lease liabilities	671	660	[1]
Long-term operating lease liabilities	9,250	8,889	[1]
Long term finance lease liabilities	979	1,152	[1]
Total lease liabilities	$ 11,872	$ 11,389

[1] The balance sheet at December 31, 2020 has been derived from the audited financial statements at that date