Annual report pursuant to Section 13 and 15(d)

Debt (Narrative) (Details)

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Debt (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 14, 2017
Jun. 29, 2016
Dec. 31, 2019
Debt Instrument [Line Items]      
Line Of Credit Facility Current Borrowing Capacity   $ 20.0  
Term Loan [Member]      
Debt Instrument [Line Items]      
Loans payable   $ 15.0  
Term Loan [Member] | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument interest rate spread   5.75%  
Additional Term Loan [Member]      
Debt Instrument [Line Items]      
Commitment fee percentage     2.30%
Borrowings $ 4.2    
Commitment fees, amount     $ 5.0
Line Of Credit Facility Current Borrowing Capacity   $ 5.0  
Additional Term Loan [Member] | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument interest rate spread 5.75%