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Note 7 - Commitments and Contingencies Liabilities (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Letters of Credit Outstanding, Amount	$ 33,400	$ 36,300

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant