Note 11 - Summary of Restricted Stock Activity (Details) - Restricted Stock [Member] - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Non–vested restricted shares at January 1, 2014 (in shares)	6,000	12,000
Non–vested restricted shares at January 1, 2014 (in dollars per share)	$ 34.46	$ 34.46
Award shares vested (in shares)	6,000	6,000
Award shares vested (in dollars per share)	$ 34.46	$ 34.46
Non–vested restricted shares at December 31, 2014 (in shares)		6,000
Non–vested restricted shares at December 31, 2014 (in dollars per share)		$ 34.46