Note 14 - Reserves - Allowance for Doubtful Accounts and Reserves for Environmental Liabilities (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	$ 154	$ 220
SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Cost and Expense	23	(66)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	$ 177	$ 154