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Note 17 - Guarantor Subsidiaries (Details Textual) | 12 Months Ended
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Dec. 31, 2018
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions | 100.00%

X
- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration