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Note 4 - Inventory (Tables)
 6 Months Ended
Jun. 30, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
             
   
June 30,
2019
    
December 31,
2018
  
                 
Raw materials and component parts
   $
2,412,331
     $
2,313,664
  
Work-in-process
    
2,154,000
      
1,209,117
  
Finished products
    
1,840,123
      
2,201,693
  
Total inventory
   $
6,406,454
      
5,724,474
  
Less: inventory reserves
    
242,342
      
226,492
  
Net inventory
   $
6,164,112
     $
5,497,982