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Note 14 - Stockholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Preferred Stock and Accrued Dividends [Table Text Block]
   
Series A-1
    
Accrued
Dividends
  
                 
Balance – January 1, 2017
    
90,000
     $
270,000
  
Accrual of dividends – Q1 2017
    
-
      
135,000
  
Accrual of dividends – Q2 2017
    
-
      
135,000
  
Accrual of dividends – Q3 2017
    
-
      
135,000
  
Conversion into common stock – September 2017
    
-
      
(540,000
)
Conversion into common stock – October 2017
    
(27,404
)
    
-
  
Accrual of dividends – Q4 2017
    
-
      
101,658
  
Balance – December 31, 2017
    
62,596
     $
236,658
  
Accrual of dividends – Q1 2018
    
-
      
93,894
  
Conversion into common stock – April 2018
    
(39,088
)
    
(330,552
)
Accrual of dividends – Q2 2018 (until final conversion)
    
-
      
25,463
  
Conversion into common stock – May 2018
    
(23,508
)
    
(25,463
)
Balance – December 31, 2018
    
-
     $
-
  
   
Series B-1
    
Accrued
Dividends
  
                 
Balance – January 1, 2017
    
105,000
     $
131,250
  
Accrual of dividends – Q1 2017
    
-
      
65,625
  
Accrual of dividends – Q2 2017
    
-
      
65,625
  
Accrual of dividends – Q3 2017
    
-
      
65,625
  
Accrual of dividends – Q4 2017
    
-
      
65,625
  
Balance – December 31, 2017
    
105,000
      
393,750
  
Conversion into common stock – March 2018
    
(60,420
)
    
(417,084
)
Accrual of dividends – Q1 2018
    
-
      
62,268
  
Accrual of dividends – Q2 2018 (until final conversion)
    
-
      
16,408
  
Conversion into common stock – May 2018
    
(44,580
)
    
(55,342
)
Balance – December 31, 2018
    
-
     $
-