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Note 17 - Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 0	$ 2,400,000
Operating Lease, Payments	600,000	300,000
Property, Plant and Equipment, Gross, Ending Balance	653,676,000	563,162,000
Property, Plant and Equipment, Net, Ending Balance	450,825,000	387,275,000
Lessor, Operating Lease, Payments to be Received, Total	15,242,000
Depreciation, Total	56,168,000	55,107,000	$ 49,387,000
Majority Shareholder [Member]
Operating Lease, Payments	1,129,231
Lessor, Operating Lease, Payments to be Received, Total	12,100
Trucks under Operating Lease [Member]
Property, Plant and Equipment, Gross, Ending Balance	49,228,000	60,130,000
Property, Plant and Equipment, Net, Ending Balance	24,708,000	33,757,000
Lessor, Operating Lease, Payments to be Received, Total	15,242,000	$ 18,792,000
Depreciation, Total	6,200,000
Shop and Office Space [Member] | Majority Shareholder [Member]
Property, Plant and Equipment, Gross, Ending Balance	13,738,000
Property, Plant and Equipment, Net, Ending Balance	12,402,000
Lessor, Operating Lease, Payments to be Received, Total	705,000
Shop and Office Space [Member]
Operating Leases, Future Minimum Payments Receivable, Total	214,000
Leases without Early Cancellation Options [Member] | Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 1,500,000
Maximum [Member] | Trucks [Member]
Lessor, Operating Lease, Term of Contract (Month)	60 months
Maximum [Member] | Shop and Office Leases with Early Cancellation Options [Member]
Lessee, Operating Lease, Term of Contract (Year)	5 years
Minimum [Member] | Trucks [Member]
Lessor, Operating Lease, Term of Contract (Month)	7 months

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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