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Long-Term Debt (Details) - Credit Facility
6 Months Ended
Jun. 30, 2019
USD ($)
Long-Term Debt  
Maximum borrowing capacity $ 35,000,000
Amount outstanding under the credit facility 0
Remaining maximum borrowing capacity $ 20,358,000
Minimum | LIBOR  
Long-Term Debt  
Basis points (in percent) 1.25%
Maximum | LIBOR  
Long-Term Debt  
Basis points (in percent) 1.75%