Annual report pursuant to Section 13 and 15(d)

Debt (Lines-Of-Credit and Notes Payable, Narrative) (Details)

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Debt (Lines-Of-Credit and Notes Payable, Narrative) (Details) - USD ($)
1 Months Ended 12 Months Ended
Apr. 30, 2008
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Nov. 30, 2014
Mar. 31, 2013
2013 Notes Payable [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount           $ 75,000,000
Interest rate       5.50%   8.05%
Pacific Western Term Loan [Member]            
Debt Instrument [Line Items]            
Interest rate   6.72% 6.02%      
Non-revolving term loan   $ 2,715,000 $ 1,727,000      
Pacific Western Term Loan [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Basis spread on rate   5.25%        
Fifth Third Bank Note Payable [Member]            
Debt Instrument [Line Items]            
Interest rate   4.36% 3.62%      
Non-revolving term loan   $ 4,080,000 $ 4,326,000      
Fifth Third Bank Note Payable [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Basis spread on rate 3.00%          
NBA Line Of Credit [Member]            
Debt Instrument [Line Items]            
Interest rate   4.75% 5.00%      
Maximum borrowing capacity   $ 20,000,000        
Non-revolving term loan   $ 5,089,000 $ 2,006,000      
NBA Line Of Credit [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Effective rate   4.75%        
NBA Line Of Credit [Member] | LIBOR [Member]            
Debt Instrument [Line Items]            
Basis spread on rate   3.25%        
Fifth Third Syndicated Line-of-Credit And Fifth Third Syndicated Term Loan [Member]            
Debt Instrument [Line Items]            
Debt instrument, face amount         $ 25,000,000  
Maximum borrowing capacity   $ 100,000,000        
Notes payable and other borrowings   $ 43,800,000        
Fifth Third Syndicated Term Loan [Member]            
Debt Instrument [Line Items]            
Interest rate   4.32% 3.46%      
Maximum borrowing capacity   $ 25,000,000        
Non-revolving term loan   23,750,000 $ 25,000,000      
Notes payable and other borrowings   $ 23,800,000        
Fifth Third Syndicated LOC [Member]            
Debt Instrument [Line Items]            
Interest rate   4.27% 3.46%      
Maximum borrowing capacity   $ 75,000,000        
Non-revolving term loan   20,000,000 $ 15,000,000      
Notes payable and other borrowings   $ 20,000,000        
Fifth Third Syndicated LOC [Member] | LIBOR [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Basis spread on rate   3.75%        
Fifth Third Syndicated LOC [Member] | LIBOR [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Basis spread on rate   2.75%