Future amortization of intangible assets, net is as follows: (Details)	Sep. 30, 2021 USD ($)
Patents
Finite-Lived Intangible Asset, Expected Amortization, Year One	$ 297,000
Finite-Lived Intangible Asset, Expected Amortization, Year Two	297,000
Finite-Lived Intangible Asset, Expected Amortization, Year Three	87,000
Finite-Lived Intangible Asset, Expected Amortization, Year Four	87,000
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	676,000
Finite-Lived Intangible Assets, Net	$ 1,444,000