Note 10 - Preferred Stock (Details) - shares	Dec. 31, 2015	Dec. 31, 2014
Preferred Stock, shares authorized	10,000,000	10,000,000
Preferred Stock, shares outstanding
Preferred Class A
Preferred Stock, shares authorized	5,000,000
Preferred Stock, shares outstanding	0	0
Preferred Class B
Preferred Stock, shares authorized	5,000,000
Preferred Stock, shares outstanding	0	0

Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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 210.5-02.28)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29
-Article 5

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant