Note 21 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Liabilities, Fair Value Disclosure, Recurring	$ 0	$ 0

Aggregation of the liabilities reported on the balance sheet measured at fair value on a recurring basis by the entity.

No definition available.

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