Financing Arrangements - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2025	Mar. 31, 2025
Debt Instrument [Line Items]
Long-term debt, gross	$ 124,413	$ 110,704
Unamortized Premiums and Debt Issuance Costs	(571)	(379)
Long-term Debt	123,842	110,325
Proceeds from issuance of debt	1,600
Unsecured debt | Contrail Debt
Debt Instrument [Line Items]
Long-term debt, gross	8,143	11,877
Unsecured debt | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	23,406	15,877
Notes payable | Wolfe Lake Debt
Debt Instrument [Line Items]
Long-term debt, gross	8,989	9,059
Notes payable | Air T Acquisition 22.1
Debt Instrument [Line Items]
Long-term debt, gross	5,903	5,880
Notes payable | WASI Debt
Debt Instrument [Line Items]
Long-term debt, gross	280	398
Notes payable | AAM 24-1 Debt
Debt Instrument [Line Items]
Long-term debt, gross	40,000	30,000
Notes payable | MAC Debt
Debt Instrument [Line Items]
Long-term debt, gross	2,242	2,271
Revolver - Alerus | Unsecured debt | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 12,924	6,050
Interest rate stated percentage (as a percentage)	5.00%
Basis spread on variable rate (as a percentage)	2.00%
Unused commitments	$ 1,076
Overline Note Alerus | Unsecured debt | Revolving Credit Facility | Alerus Loan Parties
Debt Instrument [Line Items]
Interest rate stated percentage (as a percentage)	5.00%
Basis spread on variable rate (as a percentage)	2.00%
Unused commitments	$ 3,000
Term Note A - Alerus | Unsecured debt | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 9,444	9,827
Interest rate stated percentage (as a percentage)	5.00%
Basis spread on variable rate (as a percentage)	2.00%
Term Note C - Alerus | Unsecured debt | Revolving Credit Facility | Alerus Loan Parties
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,038
Interest rate stated percentage (as a percentage)	5.00%
Basis spread on variable rate (as a percentage)	2.25%
Revolver - ONB | Unsecured debt | Contrail Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 18	3,127
Basis spread on variable rate (as a percentage)	3.56%
Unused commitments	$ 24,982
Term Note J - ONB | Unsecured debt | Contrail Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,125	8,750
Basis spread on variable rate (as a percentage)	3.86%
Term Loan - Bridgewater | Notes payable | Wolfe Lake Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 8,989	9,059
Interest rate stated percentage (as a percentage)	3.65%
Term Loan - Bridgewater | Notes payable | Air T Acquisition 22.1
Debt Instrument [Line Items]
Long-term debt, gross	$ 3,500	3,500
Interest rate stated percentage (as a percentage)	4.00%
Term Loan A - ING | Notes payable | Air T Acquisition 22.1
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,231	1,298
Interest rate stated percentage (as a percentage)	3.50%
Term Loan B - ING | Notes payable | Air T Acquisition 22.1
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,172	1,082
Interest rate stated percentage (as a percentage)	4.00%
Promissory Note - Seller's Note | Notes payable | WASI Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 280	398
Interest rate stated percentage (as a percentage)	6.00%
Promissory Notes - Honeywell | Notes payable | AAM 24-1 Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 40,000	30,000
Interest rate stated percentage (as a percentage)	8.50%
Term Loan - Bank of America, N.A. | Notes payable | MAC Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 2,242	2,271
Term Loan - Bank of America, N.A. | Notes payable | MAC Debt | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percentage)	1.75%
Term Loan - Bank of America, N.A. | Notes payable | MAC Debt | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate (as a percentage)	0.11%
Parent company | Unsecured debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 35,450	35,342
Parent company | Debt - Trust Preferred Securities | Unsecured debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 35,450	$ 35,342
Interest rate stated percentage (as a percentage)	8.00%
Subsidiaries
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 13,000