Note 3 - Stock-Based Compensation (Details) - Option Activity (USD $)	3 Months Ended
	Mar. 31, 2014
Option Activity [Abstract]
Outstanding - beginning of year	109,871
Outstanding - beginning of year	$ 9.49
Exercised	(12,538)
Exercised	$ 12.49
Exercised		[1]
Cancelled/forfeited	(214)
Cancelled/forfeited	$ 11.73
Expired	(9,698)
Expired	$ 13.36
Outstanding at March 31, 2014	87,421
Outstanding at March 31, 2014	$ 8.63
Outstanding at March 31, 2014	5 years 109 days
Outstanding at March 31, 2014	571,519	[1]
Exercisable at March 31, 2014	43,587
Exercisable at March 31, 2014	$ 11.37
Exercisable at March 31, 2014	3 years 73 days
Exercisable at March 31, 2014	$ 185,022	[1]

[1] The intrinsic value of outstanding and exercisable stock options is determined based on the amount by which the market value of the underlying stock exceeds the exercise price of the option. The per share market value of our Common Stock, as determined by the closing price on March 31, 2014 (the last trading day of the quarter), was $14.72.