Note 16 - Stock Based Compensation (Details) - Options Outstanding	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options outstanding (in Shares) | shares	1,946,225
Options outstanding, weighted-average exercise price	$ 3.56
Options exercisable (in Shares) | shares	772,949
Options exercisable, weighted-average exercise price	$ 4.18
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	1.55
Upper range limit	$ 2.95
Options outstanding (in Shares) | shares	625,125
Options outstanding, weighted-average remaining contractual life	6 years 255 days
Options outstanding, weighted-average exercise price	$ 2.33
Options exercisable (in Shares) | shares	208,837
Options exercisable, weighted-average exercise price	$ 2.30
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	3.14
Upper range limit	$ 3.55
Options outstanding (in Shares) | shares	667,950
Options outstanding, weighted-average remaining contractual life	8 years 73 days
Options outstanding, weighted-average exercise price	$ 3.46
Options exercisable (in Shares) | shares	166,250
Options exercisable, weighted-average exercise price	$ 3.21
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	3.68
Upper range limit	$ 8.00
Options outstanding (in Shares) | shares	637,750
Options outstanding, weighted-average remaining contractual life	6 years
Options outstanding, weighted-average exercise price	$ 4.67
Options exercisable (in Shares) | shares	382,462
Options exercisable, weighted-average exercise price	$ 5.31
Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower range limit	11.77
Upper range limit	$ 12.13
Options outstanding (in Shares) | shares	15,400
Options outstanding, weighted-average remaining contractual life	255 days
Options outstanding, weighted-average exercise price	$ 11.91
Options exercisable (in Shares) | shares	15,400
Options exercisable, weighted-average exercise price	$ 11.91