Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	[1]
Operating lease assets	$ 4,446	$ 4,827
Finance lease assets	2,842
Total leased assets	7,288
Current operating lease liabilities	791	858
Current finance lease liabilities	643	557
Long-term operating lease liabilities	4,132	4,366
Long term finance lease liabilities	1,486	$ 1,451
Total lease liabilities	$ 7,052

[1] The balance sheet at December 31, 2019 has been derived from the audited financial statements at that date