Note 10 - Commitments and Contingencies (Details Textual)	Jun. 30, 2023 USD ($)
Lessee, Operating Lease, Liability, to be Paid, Total	$ 674,000
Capital Addition Purchase Commitments [Member] | Revenue Equipment [Member]
Purchase Obligation, to be Paid, Remainder of Fiscal Year	84,200,000
Capital Addition Purchase Commitments [Member] | Building Construction [Member]
Purchase Obligation, to be Paid, Remainder of Fiscal Year	$ 2,500,000