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Note 10 - Leasing Activities (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Leases, Rent Expense | $ 183,091,000 | $ 182,040,000 | $ 176,891,000
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals | 71,000,000 |  |
Land and Building [Member] |  |  |
Operating Leases, Rent Expense | 9,500,000 | 10,300,000 | 11,800,000
Vehicle Leases as Lessee 1 [Member] |  |  |
Guaranteed Residual Value Under Capital Lease Arrangements | 37,000,000 |  |
Operating Leases, Rent Expense | 900,000 | 1,300,000 | 2,400,000
Vehicle Leases as Lessor [Member] |  |  |
Operating Leases, Income Statement, Minimum Lease Revenue | 187,400,000 | 182,100,000 | 175,000,000
Operating Leases, Income Statement, Contingent Revenue | 29,000,000 | 27,800,000 | $ 27,400,000
Property Subject to or Available for Operating Lease, Net | 584,400,000 | 570,100,000 |
Property Subject to or Available for Operating Lease, Accumulated Depreciation | 310,500,000 | 262,600,000 |
Minimum [Member] | Land and Building [Member] |  |  |
Monthly Rental Payment Operating Lease | $ 275 |  |
Minimum [Member] | Vehicle Leases as Lessee 1 [Member] |  |  |
Lease Term | 1 year |  |
Minimum [Member] | Vehicle Leases as Lessor [Member] |  |  |
Lease Term | 1 year |  |
Maximum [Member] | Land and Building [Member] |  |  |
Monthly Rental Payment Operating Lease |  | $ 46,479 |
Maximum [Member] | Vehicle Leases as Lessee 1 [Member] |  |  |
Lease Term | 10 years |  |
Maximum [Member] | Vehicle Leases as Lessor [Member] |  |  |
Lease Term | 10 years |  |

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- Definition Guaranteed residual value under capital lease arrangements. + References No definition available. + Details
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- Definition Represents the lease term. + References No definition available. + Details
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- Definition Amount of monthly rental payment under the operating lease. + References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Definition Contractually required future rental payments receivable on noncancelable subleasing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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- Definition Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
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- Definition The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707 + Details
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- Definition The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=77907726&loc=d3e41460-112716 + Details
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- Definition The amount of property, by major property class, net of accumulated depreciation, subject to or available for lease as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84164653&loc=d3e41551-112718 + Details
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