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Note 8 - Common Stock (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Share-based Compensation, Activity [Table Text Block]
   
 
 
 
Number
of Shares
   
 
Weighted-
Average
Exercise
Price
   
Weighted-
Average
Remaining
Contractual
Term (yrs)
   
 
 
Aggregate
Intrinsic
Value
 
Outstanding at December 31, 201
6
   
3,499,475
    $
1.21
     
 
     
 
 
Granted
   
3,680,000
     
0.05
     
 
     
 
 
Exercised
   
-
     
-
     
 
     
 
 
Forfeited or expired
   
(155,200
)    
15.25
     
 
     
 
 
Outstanding at December 31, 201
7
   
7,024,275
    $
0.29
     
8.8
    $
-0-
 
Exercisable at December 31, 201
7
   
1,951,484
    $
0.90
     
6.6
    $
-0-
 
Schedule of Warrant Activity [Table Text Block]
   
 
Number of Shares
   
Weighted Average
Exercise Price
 
Outstanding at December 31, 2016
   
32,751,578
    $
0.07
 
Issued
   
-
     
-
 
Exercised
   
(31,639,577
)    
0.02
 
Forfeited or expired
   
(1,112,001
)    
0.57
 
Outstanding
and exercisable at December 31, 2017
   
-0-
    $
-
 
Schedule of Stock by Class [Table Text Block]
Stock Option Plans
   
7,550,300
 
Series B Convertible Preferred Stock
   
285,714
 
Series C Convertible Preferred Stock
   
171,349,733
 
Series D Convertible Preferred Stock
   
66,666,666
 
Total
   
245,852,413