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Note 9 - Commitments and Contingencies (Details Textual) - USD ($)
Mar. 31, 2025
Jun. 01, 2023
Lessee, Operating Lease, Liability, to be Paid $ 742,000  
Auto Liability Claim [Member] | Minimum [Member]    
Liability Claim, Amount 10,000,000  
Auto Liability Claim [Member] | Maximum [Member]    
Liability Claim, Amount 20,000,000  
Auto Liability Claim [Member] | Uninsured Risk [Member]    
Loss Contingency Range Possible Loss Per Claim 2,000,000 $ 1,000,000
Claim Limit, Aggregate Cost 5,000,000  
Workers Compensation Liability Claim [Member] | Uninsured Risk [Member]    
Loss Contingency Range Possible Loss Per Claim 750,000  
Capital Addition Purchase Commitments [Member] | Revenue Equipment [Member]    
Purchase Obligation, to be Paid, Remainder of Fiscal Year $ 124,300,000