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Leases (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Renewal Term 5 years    
Operating Lease, Cost $ 429,000    
Operating Lease, Cost 429,000    
Operating Lease, Right-of-Use Asset, Current 131,000    
Operating Lease, Right-of-Use Asset, Noncurrent 4,017,000   $ 0
Operating Lease, Right-of-Use Asset 4,148,000 $ 4,490,000  
Operating Lease, Liability, Current (1,158,000)    
Operating Lease, Liability, Noncurrent 2,929,000   0
Operating Lease, Liability $ 4,087,000 $ 4,428,000  
Operating Lease, Weighted Average Remaining Lease Term 4 years 6 months    
Operating Lease, Weighted Average Discount Rate, Percent 0.00%    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months $ 935,000   1,291,000
Lessee, Operating Lease, Liability, Payments, Due Year Two 1,099,000   1,099,000
Lessee, Operating Lease, Liability, Payments, Due Year Three 839,000   838,000
Lessee, Operating Lease, Liability, Payments, Due Year Four 766,000   766,000
Lessee, Operating Lease, Liability, Payments, Due Year Five 661,000   661,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five 331,000   331,000
Lessee, Operating Lease, Liability, Payments, Due 4,631,000   $ 4,986,000
Lessee, Operating Lease, Imputed Interest (544,000)    
Lessee, Operating Lease, Discounted Lease Payments $ 4,087,000    
Minimum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 1 year    
Maximum [Member]      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 4 years