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Note 4 - Inventory (Tables)
6 Months Ended
Jun. 30, 2021
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   

June 30,

2021

   

December 31,

2020

 
                 

Raw materials and component parts

  $ 3,994,065     $ 3,897,133  

Work-in-process

    4,445,012       3,449,252  

Finished products

    6,523,181       3,999,920  

Total inventory

  $ 14,962,258     $ 11,346,305  

Less: inventory reserves

    380,670       315,345  

Net inventory

  $ 14,581,588     $ 11,030,960