Note 5 - Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	[1]
Operating lease assets	$ 4,637	$ 4,827
Finance lease assets	2,709
Total leased assets	7,346
Current operating lease liabilities	825	858
Current finance lease liabilities	611	557
Long-term operating lease liabilities	4,252	4,366
Long term finance lease liabilities	1,537	$ 1,451
Total lease liabilities	$ 7,225

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