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Accrued Expenses (Details) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Accrued Expenses (Details)          
Accrued Wages And Benefits $ 672,000 $ 1,188,000      
Accrued Accounts Payable 686,000 609,000      
Accrued Sales And Telecommunications Taxes 2,216,000 2,487,000      
Product Warranty Liability 51,000 50,000 $ 34,000 $ 33,000 $ 37,000
Other Accrued Expenses 615,000 570,000      
Total Accrued Expenses $ 4,240,000 $ 4,904,000