Note 7 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating lease right-of-use assets, net	$ 429	$ 1,054
Current lease liabilities	432	698
Non-current leases	0	3
Lease liabilities	432	701
Office Leases [Member]
Operating lease right-of-use assets, net	429	610
Current lease liabilities	432	698
Non-current leases	0	3
Land Leases [Member]
Operating lease right-of-use assets, net	0	444
Current lease liabilities	0	0
Non-current leases	$ 0	$ 0