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Note 6 - Other Assets (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Cost Method Investments, Fair Value Disclosure | $ 1,932 | $ 1,192

X
- Definition Fair value portion of investments accounted under the cost method. + References No definition available. + Details
Name: | us-gaap_CostMethodInvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant