Note 17 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0
Operating Lease, Payments	600,000	$ 600,000
Property, Plant and Equipment, Gross, Ending Balance	585,303,000	653,676,000
Property, Plant and Equipment, Net, Ending Balance	384,179,000	450,825,000
Lessor, Operating Lease, Payments to be Received, Total	15,907,000
Depreciation, Total	55,012,000	56,168,000	$ 55,107,000
Majority Shareholder [Member]
Lessor, Operating Lease, Payments to be Received, Total	12,100
Trucks under Operating Lease [Member]
Property, Plant and Equipment, Gross, Ending Balance	55,986,000	49,228,000
Property, Plant and Equipment, Net, Ending Balance	28,951,000	24,708,000
Lessor, Operating Lease, Payments to be Received, Total	15,907,000	15,242,000
Depreciation, Total	6,600,000
Shop and Office Space [Member] | Majority Shareholder [Member]
Operating Lease, Payments	1,405,229
Property, Plant and Equipment, Gross, Ending Balance	13,738,000
Property, Plant and Equipment, Net, Ending Balance	12,042,000
Lessor, Operating Lease, Payments to be Received, Total	173,000
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		$ 12,042,000
Shop and Office Space [Member]
Operating Lease, Liability, Total	$ 217,000
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	$ 1,000,000.0