Note 11 - Income Taxes (Details Textual) - USD ($)	Sep. 30, 2016	Dec. 31, 2013	Dec. 31, 2012
Liability for Uncertainty in Income Taxes, Current	$ 194,000	$ 194,000	$ 342,000

Amount recognized for uncertainty in income taxes classified as current.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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