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, 2023	Dec. 31, 2022
Balance at beginning of year	$ 177	$ 154
Increase	341	23
Balance at end of year	$ 518	$ 177