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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
    December 31, 2020     December 31, 2019  
             
    Land   $ 102,000     $ 102,000  
    Buildings and improvements     1,352,000       1,352,000  
    Manufacturing and warehouse equipment     2,110,000       2,107,000  
    Office equipment (incl. furniture and fixtures)     412,000       412,000  
      3,976,000       3,973,000  
    Less accumulated depreciation     (3,400,000 )     (3,329,000 )
    $ 576,000     $ 644,000