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Note 6 - Equity - Summary of Restricted Awards Activity (Details) $ / shares in Units, $ in Thousands									3 Months Ended					9 Months Ended
	Aug. 30, 2024 USD ($)	Jun. 15, 2024 USD ($)	Mar. 15, 2024 USD ($)	Sep. 15, 2023 $ / shares	Sep. 01, 2023 USD ($)	Jun. 15, 2023 USD ($) $ / shares	Mar. 15, 2023 USD ($) $ / shares	Dec. 08, 2022 $ / shares	Sep. 30, 2024 USD ($) $ / shares	Jun. 30, 2024 $ / shares	Mar. 31, 2024 USD ($) Vote $ / shares shares	Sep. 30, 2023 USD ($)	Jun. 30, 2022	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($)	Feb. 01, 2024 $ / shares	Dec. 06, 2023 $ / shares	Dec. 31, 2022 USD ($)
Compensation costs									$ 4,000			$ 3,200		$ 13,300	$ 9,700
Incremental compensation costs associated with modifications											$ 1,200
Incremental value											1,800
Reversal of previously recognized compensation expense											600
Pre-modified restricted stock award											300
Forfeiture of restricted stock units and performance stock units											300
Dividend declared \| $ / shares								$ 0.125
Dividend payable							$ 5,600		$ 735			$ 733		735	733			$ 5,500
Dividends paid amount															$ 18,000
Dividends paid \| $ / shares						$ 0.125	$ 0.125
Payment of dividends						$ 5,600								24,500
Forfeitable Dividend														$ 700
Class A Common Stock
Dividend declared \| $ / shares									$ 0.1375	$ 0.1375
Dividends paid amount	$ 6,000		$ 6,000		$ 5,500
Dividends paid \| $ / shares				$ 0.125
Payment of dividends		$ 6,100	6,100
Per share amount of a dividend declared \| $ / shares																	$ 0.1375
Class B Common Stock
Granted (in shares) \| shares														0
Dividend payable per share \| $ / shares																$ 0.2416
Dividend declared \| $ / shares									$ 0.2246	$ 0.2376
Dividends paid amount	$ 2,000				$ 1,500
Dividends paid \| $ / shares				$ 0.165
Payment of dividends		$ 2,100	$ 2,100
Percentage dividend from financial performance of carbon													20
Restricted Stock
Fair value of awards											$ 2,500
Vesting period											3 years
Restricted Stock Units
Granted (in shares) \| shares											302,699
Granted, Weighted average grant date fair value (in dollars per share) \| $ / shares											$ 17.58
Fair value of awards											$ 5,300
Vesting period											3 years
Number of voting rights \| Vote											0
Number of dividend rights \| Vote											0
Shares delivered per unit awarded \| shares											1
Payment of dividends														$ 100
Performance Stock Units
Vesting period														3 years
Number of voting rights \| Vote											0
Number of dividend rights \| Vote											0
Executives and Employees \| Restricted Stock
Granted (in shares) \| shares											179,028
Fair value of awards											$ 3,100
Executives and Employees \| Performance Stock Units
Granted (in shares) \| shares														315,941
Granted, Weighted average grant date fair value (in dollars per share) \| $ / shares														$ 28.72
Fair value of awards														$ 9,100
Vesting period											3 years
Shares delivered per unit awarded \| shares											1
Executives and Employees \| Performance Stock Units \| Minimum
Potential earnings (as a percentage)											0.00%
Executives and Employees \| Performance Stock Units \| Maximum
Potential earnings (as a percentage)											200.00%
Directors \| Restricted Stock
Fair value of awards											$ 600
Vesting period											1 year