Note 13 - Option Activity (Details)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Balance (in shares) | shares	977,867
Balance (in dollars per share) | $ / shares	$ 14.74
Granted (in shares) | shares	154,000
Granted (in dollars per share) | $ / shares	$ 22.37
Exercised (in shares) | shares	(270,283)
Exercised (in dollars per share) | $ / shares	$ 12.91
Forfeited (in shares) | shares	(11,400)
Forfeited (in dollars per share) | $ / shares	$ 17.70
Balance (in shares) | shares	850,184
Balance (in dollars per share) | $ / shares	$ 16.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares	512,634
Exercisable at December 31, 2015 (in dollars per share) | $ / shares	$ 14.50