XML 47 R37.htm IDEA: XBRL DOCUMENT v3.22.1
Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Revenue Recognition (Details) - Company`s receivables and contract liabilities with customers [Line Items]    
Gross receivables $ 2,881,000 $ 2,572,000
Allowance for bad debts 465,000 423,000
Net receivables 2,416,000 2,149,000
Contract liabilities $ 3,236,000 $ 2,011,000