Annual report pursuant to Section 13 and 15(d)

PATENTS (Details)

v3.20.1
PATENTS (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Dec. 29, 2017
May 21, 2013
Feb. 28, 2013
Patents, net $ 1,819,000 $ 1,989,000 $ 88,000 $ 409,000 $ 169,000
Patents [Member]          
Gross carrying amount 7,797,000 7,682,000      
Accumulated amortization - patents (5,978,000) (5,693,000)      
Patents, net $ 1,819,000 $ 1,989,000