Note 16 - Commitments and Contingencies (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 01, 2019 USD ($)	Dec. 31, 2015	Dec. 31, 2014
Self Insurance Auto Liability Claims Threshold Amount				$ 1,000,000
Operating Leases Number of Trucks			56		471	471
Operating Leases, Rent Expense, Total	$ 0	$ 47,000	$ 5,460,000
Settlement Of Collective And Class Action Lawsuit [Member]
Loss Contingency Accrual, Ending Balance	$ 16,500,000