Note 4 - Leases, Right-to-Use Assets and Related Liabilities - Future Minimum Payments Under Non-cancelable Operating Leases (Details) $ in Thousands	Dec. 31, 2019 USD ($)
2020	$ 684
2021	336
2022 and thereafter
Total	1,020
Less: Amounts representing present value discounts	(80)
Accounts Payable, Accrued Liabilities and Other Noncurrent Liabilities [Member]
Total lease liabilities	$ 940