Note 12 - Subsequent Events (Details Textual) - Maximum [Member] - Subsequent Event [Member] $ in Millions	Nov. 01, 2017 USD ($)
Stock Repurchase Program, Authorized Amount	$ 50
Stock Repurchase Program, Period in Force	2 years

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	us-gaap_StockRepurchaseProgramPeriodInForce1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration