Note 10 - Leases - Undiscounted Payments Under Non-cancelable Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
2022, finance leases	$ 488
2022, operating leases	531
2023, finance leases	315
2023, operating leases	513
2024, finance leases	23
2024, operating leases	227
2025, finance leases	10
2025, operating leases	118
2026, finance leases	10
Finance leases, total minimum lease payments	846
Operating leases, total minimum lease payments	1,389
Finance leases, less: Amount representing interest	(28)
Operating leases, less: Amount representing interest	(76)
Present value of minimum finance lease payments	818	$ 1,271
Current portion, finance leases	(470)	(493)
Finance leases obligations, net of current portion	348	778
Other Current Liabilities and Other Noncurrent Liabilities [Member]
Present value of minimum operating lease payments	1,313	1,357
Other Current Liabilities [Member]
Current portion, operating leases	(493)	(461)
Other Noncurrent Liabilities [Member]
Operating lease obligations, net of current portion	$ 820	$ 896