Note 5 - Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating lease right-of-use assets, net	$ 1,336
Current lease liabilities	1,512
Non-current leases	10
Lease liabilities	1,522
Office Leases [Member]
Operating lease right-of-use assets, net	797
Current lease liabilities	935
Non-current leases	10
Land Leases [Member]
Operating lease right-of-use assets, net	539
Current lease liabilities	577
Non-current leases