Note 13 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Lessee, Operating Lease, Monthly Rent Payments		$ 1
Operating Lease, Expense	$ 2		$ 7	$ 8	$ 12
Operating Lease, Liability, Total	0			0		$ 0
Operating Lease, Right-of-Use Asset	$ 0			$ 0		$ 0