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Note 17 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0
Operating Lease, Payments	500,000	$ 600,000
Property, Plant and Equipment, Gross, Ending Balance	705,919,000	585,303,000
Property, Plant and Equipment, Net, Total	463,595,000	384,179,000
Lessor, Operating Lease, Payments to be Received, Total	11,581,000
Depreciation, Total	62,806,000	55,012,000	$ 56,168,000
Majority Shareholder [Member]
Lessor, Operating Lease, Payments to be Received, Total	32,100
Trucks under Operating Lease [Member]
Property, Plant and Equipment, Gross, Ending Balance	58,227,000	55,986,000
Property, Plant and Equipment, Net, Total	22,960,000	28,951,000
Lessor, Operating Lease, Payments to be Received, Total	11,549,000	$ 15,907,000
Depreciation, Total	7,000,000.0
Shop and Office Space [Member] | Majority Shareholder [Member]
Operating Lease, Payments	1,780,813
Property, Plant and Equipment, Gross, Ending Balance	13,738,000
Property, Plant and Equipment, Net, Total	11,674,000
Lessor, Operating Lease, Payments to be Received, Total	32,100
Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation	13,738,000
Property, Plant, and Equipment, Lessor Asset under Operating Lease, after Accumulated Depreciation, Total	11,674,000
Shop and Office Space [Member]
Operating Lease, Liability, Total	232,000
Trucks under Operating Lease [Member]
Lessor, Operating Lease, Term of Contract (Year)		5 years
Maximum [Member] | Trucks [Member]
Lessor, Operating Lease, Term of Contract (Year)		60 years
Maximum [Member] | Shop and Office Leases with Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)		5 years
Maximum [Member] | Leases without Early Cancellation Options [Member]
Operating Lease, Right-of-Use Asset	$ 400,000

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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