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, 2019
Dec. 31, 2018
Valuation and qualifying accounts    
Beginning Balance $ 785 $ 862
Charged to Cost and Expense   (75)
Deductions 20 2
Ending Balance $ 765 $ 785