Note 14 - Stock Based Compensation - Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 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	(21,664)
Exercised (in dollars per share) | $ / shares	$ 6.52
Forfeited (in shares) | shares	(4,111)
Forfeited (in dollars per share) | $ / shares	$ 6.06
Expired (in shares) | shares	(3,111)
Expired (in dollars per share) | $ / shares	$ 5.35
Outstanding—shares underlying awards (in shares) | shares	198,563
Outstanding—weighted average exercise price (in dollars per share) | $ / shares	$ 6.73
Exercisable—December 31, 2016 (in shares) | shares	184,674
Exercisable—December 31, 2016 (in dollars per share) | $ / shares	$ 6.62