Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease right-of-use assets, net	$ 730	$ 1,054
Current lease liabilities	430	698
Non-current leases		3
Lease liabilities	430	701
Office Leases [Member]
Operating lease right-of-use assets, net	393	610
Current lease liabilities	430	698
Non-current leases		3
Land Leases [Member]
Operating lease right-of-use assets, net	337	444
Current lease liabilities
Non-current leases