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INVENTORIES (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
INVENTORIES    
Raw material $ 2,063,000 $ 2,077,000
Work in process 1,336,000 1,127,000
Finished goods 15,232,000 15,158,000
Inventories $ 18,631,000 $ 18,362,000