Note 12 - Employee Benefit Plans (Details) - Employee Stock Purchase Plan (2011 Employee Stock Purchase Plan [Member], USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Note 12 - Employee Benefit Plans (Details) - Employee Stock Purchase Plan [Line Items]
Shares (in Shares)	3,239	3,692
Minimum [Member]
Note 12 - Employee Benefit Plans (Details) - Employee Stock Purchase Plan [Line Items]
Price per share	22.32	20.88
Maximum [Member]
Note 12 - Employee Benefit Plans (Details) - Employee Stock Purchase Plan [Line Items]
Price per share	23.40	21.74