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Note 5 - Inventories, Net (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
June 30, 2019
    
December 31, 2018
  
                 
Raw materials
   $
1,701,667
     $
2,016,488
  
Work-in-process
    
590,999
      
205,385
  
Finished goods
    
-
      
-
  
Gross inventories
    
2,292,666
      
2,221,873
  
Less reserve for obsolescence
    
(410,000
 )    
(360,000
 )
Inventories, net
   $
1,882,666
     $
1,861,873