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Note 6 - Investment in and Transactions with Unconsolidated Subsidiaries (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Equity Method Investments [Table Text Block]
   
September 30, 2019
    
December 31, 2018
  
Assets:
  
(unaudited)
    
(unaudited)
  
Current assets
   $
14,186,280
     $
10,587,648
  
Non-current assets
    
4,756,043
      
4,603,845
  
Total assets:
   $
18,942,323
     $
15,191,493
  
                 
Liabilities:
                
Current liabilities
   $
23,477,542
     $
17,696,033
  
Stockholders' equity (deficit)
    
(4,535,219
 )    
(2,504,900
 )
Total liabilities and stockholders’ deficit
   $
18,942,323
     $
15,191,133
  
   
For the three months ended September 30, 2019
    
For the three months ended September 30, 2018
    
For the nine months ended September 30, 2019
    
For the nine months ended September 30, 2018
  
   
(unaudited)
    
(unaudited)
    
(unaudited)
    
(unaudited)
  
Net sales
   $
678,140
     $
1,710,473
     $
2,431,942
     $
3,795,507
  
Cost of goods sold
    
423,948
      
789,957
      
983,348
      
1,888,409
  
Gross profit
    
254,192
      
920,516
      
1,448,594
      
1,907,098
  
Other expenses
    
(598,324
 )    
(1,371,085
 )    
(3,900,382
 )    
(3,742,737
 )
Net loss
   $
(344,132
 )   $
(450,569
 )   $
(2,451,788
 )   $
(1,835,639
 )