Note 4 - Fair Value Measurement (Details Textual)	Sep. 30, 2016 USD ($)
Liabilities, Fair Value Disclosure, Recurring	$ 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