Note 10 - Fair Value Measurements (Details Textual)	3 Months Ended	12 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Discount Rate	4.25%	4.00%

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration