Note 9 - Equity - Dividends (Details) $ / shares in Units, $ in Thousands				1 Months Ended		3 Months Ended			12 Months Ended
	Mar. 15, 2024 USD ($)	Dec. 15, 2023 USD ($) $ / shares	Sep. 15, 2023 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Jun. 30, 2022	Dec. 31, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2022 USD ($) $ / shares	Mar. 17, 2025 $ / shares	Dec. 06, 2023 $ / shares	Dec. 31, 2021 USD ($)
EQUITY
Cash dividends declared | $					$ 6,000				$ 19,058	$ 27,494	$ 23,064
Forfeitable Dividend | $							$ 1,200		800
Payment of dividends | $									24,600	$ 25,800	$ 20,000
Dividend payable per share											$ 0.52
Quarterly dividend per share					$ (0.125)		$ (0.125)			$ (0.125)
Percentage dividend from financial performance of carbon								20
Dividend payable | $				$ 7,085	$ 7,198	$ 7,085	$ 7,198		7,085	$ 7,198	$ 5,524			$ 2,500
Class A shareholders
EQUITY
Cash dividends declared | $				$ 6,300		6,400			12,100
Class B shareholders
EQUITY
Cash dividends declared | $						$ 2,200			$ 6,200
Class A Common Stock
EQUITY
Payment of dividends | $										$ 16,600
Dividend payable per share					$ 0.375		$ 0.375			$ 0.375		$ 0.06875
Quarterly dividend per share				$ 0.125		$ 0.125			$ 0.125
Per share amount of a dividend declared													$ 0.1375
Dividends paid amount | $	$ 6,000
Class A Common Stock | Annual dividends
EQUITY
Dividend declared									0.55
Class A Common Stock | Q1 Dividends
EQUITY
Dividend declared									0.1375
Class A Common Stock | Q2 Dividends
EQUITY
Dividend declared									0.1375
Class A Common Stock | Q3 Dividends
EQUITY
Dividend declared									0.1375
Class A Common Stock | Q4 Dividends
EQUITY
Dividend declared									0.1375
Class B Common Stock
EQUITY
Percentage dividend from financial performance of carbon										20
Dividend payable | $		$ 2,200	$ 1,500
Dividends paid		$ 0.249	$ 0.165
Class B Common Stock | Class A shareholders
EQUITY
Cash dividends declared | $				$ 6,000		$ 6,000
Class B Common Stock | Class B shareholders
EQUITY
Cash dividends declared | $						2,100
Class B Common Stock | Annual dividends
EQUITY
Dividend declared									0.94
Class B Common Stock | Q1 Dividends
EQUITY
Dividend declared									0.242
Class B Common Stock | Q2 Dividends
EQUITY
Dividend declared									0.2376
Class B Common Stock | Q3 Dividends
EQUITY
Dividend declared									0.2246
Class B Common Stock | Q4 Dividends
EQUITY
Dividend declared									$ 0.2364
Common Class B Forfeitable Dividend Equivalent Unit | Class A shareholders
EQUITY
Cash dividends declared | $				$ 300		400
Common Class B Forfeitable Dividend Equivalent Unit | Class B shareholders
EQUITY
Cash dividends declared | $						$ 100