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

June 30,

   

December 31,

 
   

2021

   

2020

 
                 

Raw materials

  $ 12,497,000     $ 9,729,000  

Work in process

    2,796,000       2,003,000  

Finished goods

    6,704,000       5,017,000  
    $ 21,997,000     $ 16,749,000