Note 10 - Commitments and Contingencies (Details Textual) $ in Thousands	3 Months Ended
Mar. 31, 2020 USD ($)
Capital Addition Purchase Commitments [Member]
Long-term Purchase Commitment, Amount	$ 1,253

The minimum amount the entity agreed to spend under the long-term purchase commitment.

No definition available.

Name:	us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration