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Note 13 - Earnings (Loss) Per Share - Common Stock ("EPS") - Securities Excluded From the Diluted Per Share Calculation (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Exercise Price Greater Than Average Market Price Of Common Shares [Member]        
Antidilutive securities (in shares) 9,448,988 1,728,364 8,679,827 1,521,862
Exercise Price Greater Than Average Market Price Of Common Shares [Member] | Share-based Payment Arrangement, Option [Member]        
Antidilutive securities (in shares) 1,755,556 1,541,558 1,755,556 1,335,056
Exercise Price Greater Than Average Market Price Of Common Shares [Member] | Warrant [Member]        
Antidilutive securities (in shares) 5,780,978 186,806 5,780,978 186,806
Exercise Price Greater Than Average Market Price Of Common Shares [Member] | Convertible Debt Securities [Member]        
Antidilutive securities (in shares) 1,912,454 1,143,293
Exercise Price Less Than Average Market Price Of Common Shares [Member]        
Antidilutive securities (in shares) 786,249 2,906,754
Exercise Price Less Than Average Market Price Of Common Shares [Member] | Share-based Payment Arrangement, Option [Member]        
Antidilutive securities (in shares) 256 11,838
Exercise Price Less Than Average Market Price Of Common Shares [Member] | Preferred Stock 1 [Member]        
Antidilutive securities (in shares) 1,902,342
Exercise Price Less Than Average Market Price Of Common Shares [Member] | Warrant [Member]        
Antidilutive securities (in shares) 785,993 992,574