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Note 7 - Leases (Details Textual) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Leveraged Leases, Net Investment in Leveraged Leases Disclosure, Residual Value of Leased Assets | $ 1 | $ 4

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- Definition The estimate of the value of the leased asset at the end of the lease term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 30 -Paragraph 14 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77895730&loc=d3e42840-112730 + Details
Name: | us-gaap_LeveragedLeasesNetInvestmentInLeveragedLeasesDisclosureResidualValueOfLeasedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant