Note 6 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Operating lease right-of-use assets, net	$ 675	$ 1,054
Current lease liabilities	596	698
Non-current leases	0	3
Lease liabilities	596	701
Office Leases [Member]
Operating lease right-of-use assets, net	562	610
Current lease liabilities	596	698
Non-current leases	0	3
Land Leases [Member]
Operating lease right-of-use assets, net	113	444
Current lease liabilities	0	0
Non-current leases	$ 0	$ 0