Note 14 - Accrued Liabilities - Components of Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Contract liabilities (Note 2)	$ 390	$ 850
Accrued remediation contingency (Note 9)	0	176
Other accrued liabilities	471	1,073
Total other accrued liabilities	$ 861	$ 2,099