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Note 5 - Inventories, Net (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
Inventories consist of:
                
   
March 31, 2019
    
December 31, 2018
  
                 
Raw materials
   $
1,799,361
     $
2,016,488
  
Work-in-process
    
330,966
      
205,385
  
Finished goods
    
-
      
-
  
Gross inventories
    
2,130,327
      
2,221,873
  
Less reserve for obsolescence
    
(385,000
 )    
(360,000
 )
Inventories, net
   $
1,745,327
     $
1,861,873