Note 8 - Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) lease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of operating leases | lease	1
Operating lease expenses	$ 100	$ 100	$ 100
Financing lease right-of-use assets, net	9,128
Operating Lease, Right-of-Use Asset	$ 25	$ 110
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Total right-of-use assets	$ 9,153	$ 110
Finance Lease, Liability, Current	3,461
Operating Lease, Liability, Current	$ 25	$ 79
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Finance Lease, Liability, Noncurrent	$ 4,599
Operating Lease, Liability, Noncurrent		$ 31
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
Present value of lease obligations	$ 8,085	$ 110
Financing lease obligations	8,060	0
Operating Lease, Liability	$ 25	$ 100
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities, Other Liabilities, Noncurrent
Lease liability current	$ 3,500
Maximum
Lessee, Lease, Description [Line Items]
Term of financing leases	36 months