Note 17 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Letters of Credit Outstanding, Amount	$ 1.2	$ 1.3

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

No definition available.

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