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Note 10 - Commitments and Contingencies (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Long-term Purchase Commitment, Amount	$ 2,363

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