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Note F - Reserved Authorized Shares of Common Stock for Future Issuance (Details) - shares
Jun. 30, 2016
Dec. 31, 2015
Convertible Notes Payable [Member]    
Common shares reserved for future issuance (in shares) 2,088,931 1,991,219
2021 Notes [Member]    
Common shares reserved for future issuance (in shares) 5,040,914
Stock Compensation Plan [Member]    
Common shares reserved for future issuance (in shares) 2,238,153 1,397,511
Possible Future Issuances Under Equity Incentive Plans [Member]    
Common shares reserved for future issuance (in shares) 1,130,111 1,410,848
Warrant [Member]    
Common shares reserved for future issuance (in shares) 2,087,477 2,325,383
Common shares reserved for future issuance (in shares) 12,585,586 7,124,961