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Note 12 - Subsequent Events (Details)
$ / shares in Units, $ in Millions
3 Months Ended
May 08, 2024
May 07, 2024
USD ($)
Feb. 15, 2023
USD ($)
Jun. 30, 2022
Jun. 30, 2024
$ / shares
Mar. 31, 2024
USD ($)
Feb. 01, 2024
$ / shares
Subsequent Events              
Percentage dividend from financial performance of carbon       20      
Class B Common Stock              
Subsequent Events              
Dividend payable per share | $ / shares             $ 0.2416
Revolving Credit Facility              
Subsequent Events              
Line of Credit Facility, Maximum Borrowing Capacity     $ 125.0        
Accordion feature     $ 50.0        
Initial aggregate revolving commitment           $ 106.8  
Revolving Credit Facility | Secured overnight financing rate              
Subsequent Events              
Interest rate, basis spread     2.00%        
Revolving Credit Facility | Base Rate              
Subsequent Events              
Interest rate, basis spread     1.50%        
Subsequent Event | Secured overnight financing rate              
Subsequent Events              
Interest rate, basis spread 2.50%            
Subsequent Event | Base Rate              
Subsequent Events              
Interest rate, basis spread 2.00%            
Subsequent Event | Fed Funds Effective Rate Overnight Index Swap Rate | Minimum              
Subsequent Events              
Interest rate, basis spread 0.50%            
Subsequent Event | Fed Funds Effective Rate Overnight Index Swap Rate | Maximum              
Subsequent Events              
Interest rate, basis spread 3.00%            
Subsequent Event | Class A Common Stock              
Subsequent Events              
Dividend payable per share | $ / shares         $ 0.1375    
Subsequent Event | Class B Common Stock              
Subsequent Events              
Dividend payable per share | $ / shares         $ 0.2376    
Subsequent Event | Revolving Credit Facility              
Subsequent Events              
Percentage dividend from financial performance of carbon   20          
Line of Credit Facility, Maximum Borrowing Capacity   $ 200.0          
Accordion feature   $ 75.0