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Note 4 - Details of Consolidated Balance Sheet Accounts - Prepaid Expenses and Other (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Insurance premiums	$ 1,831		$ 3,057
Contract assets	1,823
Other	2,971		2,786
	19,924	$ 22,255	19,810
Tires In Service [Member]
Prepaid expenses	5,011		4,787
License Fees Member [Member]
Prepaid expenses	4,760		4,858
Parts And Tires Inventory [Member]
Prepaid expenses	$ 3,528		$ 4,322

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