Note 15 - Commitments and Contingencies (Details Textual) $ in Millions	6 Months Ended
Jun. 30, 2016 USD ($)
Standby Letters of Credit [Member]
Line of Credit Facility, Expiration Period	2 years 240 days
Letters of Credit Issued and Available Amount	$ 3

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_LineOfCreditFacilityExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration