Note 5 - Leases (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) lease	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) lease	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Leases [Abstract]
Term of financing leases	36 months		36 months
Number of operating leases | lease	1		1
Operating lease expenses	$ 16	$ 25	$ 41	$ 49
Financing lease right-of-use assets, net	$ 10,913		$ 10,913		$ 9,128
Operating Lease, Right-of-Use Asset					$ 25
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets		Other assets		Other assets
Total right-of-use assets	$ 10,913		$ 10,913		$ 9,153
Finance Lease, Liability, Current	$ 4,465		$ 4,465		3,461
Operating Lease, Liability, Current					$ 25
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other liabilities		Other liabilities		Other liabilities
Finance Lease, Liability, Noncurrent	$ 4,501		$ 4,501		$ 4,599
Present value of lease obligations	$ 8,966		$ 8,966		$ 8,085