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Note 7 - Inventories, Net (Tables)
3 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
  

March 31,

2022

  

December 31,

2021

 

Raw materials

 $1,531,000  $1,249,000 

Work in process

  2,635,000   2,492,000 

Finished goods

  4,532,000   4,425,000 

Allowance for excess quantities

  (202,000

)

  (290,000

)

Total inventories

 $8,496,000  $7,876,000