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Financing Arrangements - Narrative (Details) - USD ($)
shares in Thousands
3 Months Ended 9 Months Ended
Jun. 23, 2023
May 26, 2023
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 01, 2023
Oct. 18, 2023
Oct. 17, 2023
Mar. 31, 2023
Jan. 07, 2022
Debt Instrument                    
Long-term debt, gross     $ 101,231,000 $ 101,231,000         $ 125,914,000  
Gross proceeds       7,285,000 $ 0          
Trust Preferred Capital Security | Market Offering Agreement                    
Debt Instrument                    
Maximum aggregate offering price             $ 7,300,000 $ 6,500,000    
TruPs issued (in shares)     15              
Gross proceeds     $ 300,000              
Trust Preferred Capital Security | Private Placement                    
Debt Instrument                    
TruPs issued (in shares)     413              
Gross proceeds     $ 7,000,000              
Unsecured debt | Parent company                    
Debt Instrument                    
Long-term debt, gross     50,962,000 50,962,000         47,963,000  
Unsecured debt | Contrail Debt                    
Debt Instrument                    
Long-term debt, gross     24,918,000 24,918,000         50,621,000 $ 43,600,000
Unsecured debt | AirCo 1 Debt                    
Debt Instrument                    
Long-term debt, gross     5,434,000 5,434,000         6,393,000  
Term Loan G - ONB | Unsecured debt | Contrail Debt                    
Debt Instrument                    
Principle amount   $ 38,200,000                
Long-term debt, gross     24,918,000 $ 24,918,000         38,180,000  
Term Loan G - ONB | Unsecured debt | Contrail Debt | 1 Month SOFR                    
Debt Instrument                    
Basis spread on variable rate (as a percentage)   3.11%   3.11%            
Revolver - ONB | Unsecured debt | Contrail Debt                    
Debt Instrument                    
Principle amount   $ 25,000,000                
Long-term debt, gross     0 $ 0         12,441,000  
Revolver - ONB | Unsecured debt | Contrail Debt | 1 Month SOFR                    
Debt Instrument                    
Basis spread on variable rate (as a percentage)   3.56%   3.56%            
Term Loan - PSB | Unsecured debt | AirCo 1 Debt                    
Debt Instrument                    
Principle amount   $ 6,400,000                
Long-term debt, gross     5,434,000 $ 5,434,000         6,393,000  
Term Loan - PSB | Unsecured debt | AirCo 1 Debt | 3 Month SOFR                    
Debt Instrument                    
Basis spread on variable rate (as a percentage)   3.26%   3.26%            
Revolver - MBT | Unsecured debt                    
Debt Instrument                    
Line of credit facility, maximum seasonal increase amount $ 2,000,000                  
Credit facility maximum borrowing capacity 19,000,000         $ 17,000,000        
Revolver - MBT | Unsecured debt | Parent company                    
Debt Instrument                    
Long-term debt, gross     6,492,000 $ 6,492,000         8,742,000  
Revolver - MBT | Unsecured debt | Other Investments                    
Debt Instrument                    
Debt instrument, covenant investment in other investments $ 5,000,000                  
Revolver - MBT | Unsecured debt | Minimum                    
Debt Instrument                    
Commitment fee (as a percentage) 0.11%                  
Revolver - MBT | Unsecured debt | Maximum                    
Debt Instrument                    
Commitment fee (as a percentage) 0.15%                  
Revolver - MBT | Unsecured debt | SOFR | Minimum                    
Debt Instrument                    
Basis spread on variable rate (as a percentage) 2.25%                  
Revolver - MBT | Unsecured debt | SOFR | Minimum | Parent company                    
Debt Instrument                    
Basis spread on variable rate (as a percentage)       2.25%            
Revolver - MBT | Unsecured debt | SOFR | Maximum                    
Debt Instrument                    
Basis spread on variable rate (as a percentage) 3.25%                  
Revolver - MBT | Unsecured debt | SOFR | Maximum | Parent company                    
Debt Instrument                    
Basis spread on variable rate (as a percentage)       3.25%            
Debt - Trust Preferred Securities | Unsecured debt | Parent company                    
Debt Instrument                    
Long-term debt, gross     $ 32,662,000 $ 32,662,000         $ 25,598,000