Note 13 - Restricted Stock Activity (Details) - Restricted Stock [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Nonvested at Beginning of year (in shares)	109,614	79,591
Nonvested at Beginning of year (in dollars per share)	$ 23.91	$ 11.93
Granted (in shares)	81,080	60,098
Granted (in dollars per share)	$ 37.84	$ 32.02
Cancelled (in shares)	(10,635)	(7,500)
Cancelled (in dollars per share)	$ 32.02	$ 25.46
Vested/Released (in shares)	(29,675)	(22,575)
Vested/Released (in dollars per share)	$ 19.31	$ 10.01
Nonvested at end of year (in shares)	150,384	109,614
Nonvested at end of year (in dollars per share)	$ 34.29	$ 23.91