Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Operating lease right-of-use assets, net	$ 1,054
Current lease liabilities	698
Non-current leases	3
Lease liabilities	701
Office Leases [Member]
Operating lease right-of-use assets, net	610
Current lease liabilities	698
Non-current leases	3
Land Leases [Member]
Operating lease right-of-use assets, net	444
Current lease liabilities
Non-current leases