Note 7 - Stock-Based Compensation (Details) - Summary of Outstanding and Exercisable Options shares in Thousands	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding, shares (in Shares) | shares	90
Options outstanding, weighted-average exercise price	$ 17.50
Options outstanding, weighted-average remaining contractual term	1 year 109 days
Options exercisable, shares (in Shares) | shares	89
Options exercisable, weighted-average exercise price	$ 17.50
Range 01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit	11.09
Range of exercise prices, upper limit	$ 19.29
Options outstanding, shares (in Shares) | shares	69
Options outstanding, weighted-average exercise price	$ 16.25
Options outstanding, weighted-average remaining contractual term	1 year 6 months
Options exercisable, shares (in Shares) | shares	69
Options exercisable, weighted-average exercise price	$ 16.25
Range 02 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, lower limit	19.56
Range of exercise prices, upper limit	$ 23.02
Options outstanding, shares (in Shares) | shares	21
Options outstanding, weighted-average exercise price	$ 21.76
Options outstanding, weighted-average remaining contractual term	255 days
Options exercisable, shares (in Shares) | shares	20
Options exercisable, weighted-average exercise price	$ 21.76