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Note 6 - Commitments and Contingencies (Details Textual) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Capital Addition Purchase Commitments [Member] |
Long-term Purchase Commitment, Amount | $ 1,185

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

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=us-gaap_CapitalAdditionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |