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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2021
Schedule II Valuation and Qualifying Accounts  
Schedule II - Valuation and Qualifying Accounts Disclosure [Text Block]
  AdditionsDeductions 
 Balance at
Beginning
of Year		Charged to
Operations		Written OffBalance at
End of
Year
Allowance for Doubtful Accounts Receivable:
2021$17 $5 $(5)$17 
2020$18 $4 $(5)$17 
2019$14 $7 $(3)$18 
  AdditionsDeductions 
 Balance at
Beginning
of Year		Charged to
Operations		Credited to
Operations		Balance at
End of
Year
Deferred Tax Valuation Allowance:
2021$— $— $— $— 
2020$— $— $— $— 
2019$1 $— $(1)$—