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Borrowings (Details) - TD Bank [Member] - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Nov. 21, 2017
Nov. 20, 2017
Credit Facility [Abstract]      
Maximum borrowing capacity $ 20,000    
Percentage fee on unused borrowings 0.125%    
Loans used to fund future cash dividend payments or treasury share buybacks   $ 12,500 $ 10,000
Balance outstanding $ 0    
Prime Rate [Member]      
Credit Facility [Abstract]      
Basis spread on variable rate (1.00%)