Note 13 - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Outstanding—shares underlying awards (in shares) | shares	227,449
Outstanding—weighted average exercise price (in dollars per share) | $ / shares	$ 6.68
Granted (in shares) | shares	0
Granted (in dollars per share) | $ / shares	$ 0
Exercised (in shares) | shares	(16,332)
Exercised (in dollars per share) | $ / shares	$ 6.50
Forfeited (in shares) | shares	(3,334)
Forfeited (in dollars per share) | $ / shares	$ 6.22
Outstanding—shares underlying awards (in shares) | shares	207,783
Outstanding—weighted average exercise price (in dollars per share) | $ / shares	$ 6.70
Exercisable—June 30, 2016 (in shares) | shares	155,008
Exercisable—June 30, 2016 (in dollars per share) | $ / shares	$ 6.57