Note 10 - Subsequent Events (Details Textual)	Jan. 06, 2017 shares
Omnibus 2013 Equity Plan [Member] \| Common Class A [Member] \| Subsequent Event [Member] \| Directors and Certain Members of Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	31,000

Number of share instruments newly issued under a share-based compensation plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration