Annual report pursuant to Section 13 and 15(d)

Patents (Details)

v3.22.1
Patents (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Patents, net $ 1,384,000 $ 1,578,000
Patents [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross carrying amount 7,949,000 7,848,000
Accumulated amortization (6,565,000) (6,270,000)
Patents, net $ 1,384,000 $ 1,578,000