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Long-Term Debt (Narrative) (Details) - USD ($)
12 Months Ended
Oct. 27, 2021
Jun. 07, 2019
Feb. 04, 2019
Jun. 27, 2018
Aug. 18, 2015
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 01, 2021
Jul. 01, 2019
Debt Instrument [Line Items]                    
Long-term Debt           $ 0 $ 10,000,000      
Amortization of debt issuance costs           $ 37,000 40,000 $ 103,000    
Credit Facility Participation Fee And Fronting Fee Percentage           0.25%        
Debt instrument, term         5 years          
Unamortized Debt Issuance Expense           $ 266,000        
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity         $ 100,000,000       $ 50,000,000 $ 70,000,000
Debt Instrument, Maturity Date       Jun. 27, 2023 Aug. 18, 2020          
Repayments of Long-term Lines of Credit $ 10,000,000 $ 5,000,000 $ 5,000,000              
Line of Credit Facility, Remaining Borrowing Capacity           $ 50,000,000        
Debt instrument, term       5 years            
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Line of credit facility, interest rate at period end           0.101%        
Minimum [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           0.00%        
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           1.00%        
Minimum [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage           0.20%        
Maximum [Member] | Base Rate [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           1.00%        
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate           2.00%        
Maximum [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Commitment Fee Percentage           0.30%        
Second Amendment [Member] | Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Debt Issuance Costs, Net           $ 120,000        
Revolving Credit Facility [Member]                    
Debt Instrument [Line Items]                    
Long-term Debt             $ 10,000,000