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Note 10 - Commitments and Contingencies (Details Textual) $ in Thousands | 6 Months Ended
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Jun. 30, 2019 USD ($)
Long-term Purchase Commitment, Amount | $ 1,418

X
- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration