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Note 9 - Earnings (Loss) Per Share - Common Stock ("EPS") - Securities Excluded From the Diluted Per Share Calculation (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Exercise Price Less Than Average Market Price Of Common Shares [Member]        
Antidilutive securities (in shares) 1,237,782 5,455,377 2,873,376 5,464,583
Exercise Price Less Than Average Market Price Of Common Shares [Member] | Preferred Stock [Member]        
Antidilutive securities (in shares) 1,200,767 5,416,667 2,853,513 5,416,667
Exercise Price Less Than Average Market Price Of Common Shares [Member] | Employee Stock Option [Member]        
Antidilutive securities (in shares) 37,015 35,706 19,863 44,580
Exercise Price Less Than Average Market Price Of Common Shares [Member] | Warrant [Member]        
Antidilutive securities (in shares) 3,004 3,336
Exercise Price Greater Than Average Market Price Of Common Shares [Member]        
Antidilutive securities (in shares) 2,765,436 1,430,924 2,844,860 1,430,924
Exercise Price Greater Than Average Market Price Of Common Shares [Member] | Employee Stock Option [Member]        
Antidilutive securities (in shares) 1,366,467 218,761 1,445,891 218,761
Exercise Price Greater Than Average Market Price Of Common Shares [Member] | Warrant [Member]        
Antidilutive securities (in shares) 1,398,969 1,212,163 1,398,969 1,212,163