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Note I - Anti-dilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Warrants to Purchase Common Stock [Member]    
Antidilutive securities (in shares) 164,400 2,650,212
Stock Compensation Plan [Member]    
Antidilutive securities (in shares) 2,238,153 943,304
Convertible Debt Securities [Member]    
Antidilutive securities (in shares) 2,088,931 1,896,843
2021 Notes [Member]    
Antidilutive securities (in shares) 5,040,914
Antidilutive securities (in shares) 9,532,398 5,490,359