Annual report pursuant to Section 13 and 15(d)

Schedule II--Valuation and Qualifying Accounts (Details)

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Schedule II--Valuation and Qualifying Accounts (Details) - Allowances for accounts receivable - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Valuation and qualifying accounts    
Beginning Balance $ 765 $ 785
Charged to Cost and Expense 130  
Deductions 3 20
Ending Balance $ 892 $ 765