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) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowances for accounts receivable      
Valuation and qualifying accounts      
Beginning Balance $ 862 $ 970 $ 1,060
Charged to Cost and Expense (75) (95) (73)
Deductions 2 13 17
Ending Balance 785 862 970
Reserve for inventory obsolescence      
Valuation and qualifying accounts      
Beginning Balance 12 15 16
Charged to Cost and Expense     3
Deductions 4 3 4
Ending Balance $ 8 $ 12 $ 15