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Note 10 - Leasing Activities (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Minimum [Member] | Vehicle Leases as Lessee 1 [Member]      
Lease Term 1 year    
Minimum [Member] | Vehicle Leases as Lessor [Member]      
Lease Term 1 year    
Minimum [Member] | Land and Building [Member]      
Monthly Rental Payment Operating Lease $ 275    
Maximum [Member] | Vehicle Leases as Lessee 1 [Member]      
Lease Term 10 years    
Maximum [Member] | Vehicle Leases as Lessor [Member]      
Lease Term 10 years    
Maximum [Member] | Land and Building [Member]      
Monthly Rental Payment Operating Lease $ 48,466    
Vehicle Leases as Lessee 1 [Member]      
Guaranteed Residual Value Under Operating Lease Arrangements 1,800,000    
Guaranteed Residual Value Under Capital Lease Arrangements 32,200,000    
Operating Leases, Rent Expense 2,400,000 $ 4,100,000 $ 2,300,000
Vehicle Leases as Lessor [Member]      
Operating Leases, Income Statement, Minimum Lease Revenue 175,000,000 154,800,000 112,000,000
Operating Leases, Income Statement, Contingent Revenue 27,400,000 24,500,000 18,100,000
Property Subject to or Available for Operating Lease, Net 592,000,000 512,100,000  
Property Subject to or Available for Operating Lease, Accumulated Depreciation 233,800,000 185,000,000  
Land and Building [Member]      
Operating Leases, Rent Expense 11,800,000 12,800,000 9,100,000
Operating Leases, Rent Expense 176,891,000 $ 152,967,000 $ 109,222,000
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals $ 75,900,000