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Note 4 - Inventory (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
2018
   
December 31,
2017
 
                 
Raw materials and component parts
  $
2,547,745
    $
2,637,138
 
Work-in-process
   
641,430
     
523,644
 
Finished products
   
1,182,683
     
1,200,204
 
Total Inventory
  $
4,371,858
     
4,360,986
 
Less: inventory reserves
   
465,917
     
457,505
 
Net Inventory
  $
3,905,941
    $
3,903,481