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Schedule II (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year $ 50,000 $ 25,000 $ 0
(Recovered)/Charged to Costs and Expenses   4,000 25,000
Charged to Other Accounts   36,000 0
Deductions   15,000 0
Balance at End of Year 41,000 50,000 25,000
Allowance for Chargebacks [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Year 476,000 2,344,000 857,000
(Recovered)/Charged to Costs and Expenses   1,316,000 2,639,000
Charged to Other Accounts 0 0 0
Deductions   3,184,000 1,152,000
Balance at End of Year $ 179,000 $ 476,000 $ 2,344,000