Note 9 - Commitments and Contingencies (Details Textual)	Mar. 31, 2024 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Total	$ 485,000
Capital Addition Purchase Commitments [Member] | Revenue Equipment [Member]
Purchase Obligation, to be Paid, Remainder of Fiscal Year	185,300,000
Capital Addition Purchase Commitments [Member] | Building Construction [Member]
Purchase Obligation, to be Paid, Remainder of Fiscal Year	$ 1,600,000