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Note 2 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Insurance premiums	$ 3,653	$ 2,356
Contract assets	1,545	1,729
Other	3,103	3,166
Prepaid Expense and Other Assets, Current	21,903	20,938
License Fees Member [Member]
Prepaid expenses	5,529	5,321
Tires In Service [Member]
Prepaid expenses	4,701	4,972
Parts And Tires Inventory [Member]
Prepaid expenses	$ 3,372	$ 3,394

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