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Note 10 - Leasing Activities - Future Minimum Lease Payments Under Capital and Non-cancelable Vehicle Leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Less current portion $ (19,631) $ (17,119)
Obligations under capital leases less current portion 49,483 $ 66,022
Vehicle Leases as Lessee 1 [Member]    
2019, Capital Leases 22,033  
2019 3,580  
2020, Capital Leases 19,113  
2020 3,264  
2021, Capital Leases 14,894  
2021 2,764  
2022, Capital Leases 11,062  
2022 2,479  
2023, Capital Leases 5,095  
2023 1,957  
Thereafter, Capital Leases 2,963  
Thereafter 1,246  
Total minimum lease payments, Capital Leases 75,160  
Total minimum lease payments, Operating Leases 15,290  
Less amount representing interest, Capital Leases (6,046)  
Present value of net minimum capital lease payments 69,114  
Less current portion (19,631)  
Obligations under capital leases less current portion $ 49,483