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Note 4 - Other Accrued Expenses and Liabilities
3 Months Ended
Mar. 31, 2018
Notes to Financial Statements  
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
4.
Other Accrued Expenses and Liabilities
 
Other accrued expenses and liabilities consisted of the following:
 
   
March 31,
2018
   
December 31,
2017
 
Accrued interest payable
   
38,771
     
37,415
 
Accrued Series A dividends
   
     
1,062,314
 
Accrued payroll and payroll related expenses
   
184,689
     
312,221
 
Accrued professional fees
   
85,235
     
122,711
 
Accrued clinical studies expenses
   
55,210
     
63,350
 
Other accrued expenses
   
89,808
     
30,840
 
Total
   
453,713
     
1,628,851