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Note 2 - Antidilutive Securities Excluded from Earnings Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Restricted Stock Units (RSUs) [Member]        
Anti-dilutive Securities (in shares) 789,550 506,330 515,444 518,821
Stock Option [Member]        
Anti-dilutive Securities (in shares) 586,092 176,857 611,927 176,687
Warrant [Member]        
Anti-dilutive Securities (in shares) 203,214 203,214 203,214 157,678
Anti-dilutive Securities (in shares) 1,578,856 886,401 1,330,585 853,186