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Description of Business and Significant Accounting Policies (Details) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended
Nov. 12, 2010
Oct. 12, 2010
Oct. 12, 2010
Jul. 31, 2011
Dec. 31, 2012
segment
state
subsidiary
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Autos And Trucks [Member]
Dec. 31, 2012
Minimum [Member]
Dec. 31, 2012
Minimum [Member]
Laundry And Linen Equipment Installations [Member]
Dec. 31, 2012
Minimum [Member]
Housekeeping, And Office Furniture And Equipment [Member]
Dec. 31, 2012
Maximum [Member]
Dec. 31, 2012
Maximum [Member]
Laundry And Linen Equipment Installations [Member]
Dec. 31, 2012
Maximum [Member]
Housekeeping, And Office Furniture And Equipment [Member]
Jan. 31, 2013
Subsequent Event [Member]
Maximum [Member]
Property, Plant and Equipment [Line Items]                              
Terms of service agreement         Our agreements with clients typically provide for a one year service term, cancelable by either party upon 30 to 90 days’ notice after the initial 90-day period.                    
Service term         1 year                    
Days to notify cancellation of service                 30 days     90 days      
Initial period of service term         90 days                    
Number of reportable segments         2                    
Number of subsidiaries         2                    
Number of states subsidiary operates         2                    
Notes receivable         $ 1,639,000 $ 1,855,000                  
Discounted notes receivable         1,620,000 1,828,000                  
Marketable securities         21,322,000 31,337,000                  
Unrealized holding losses         82,000                    
Unrealized gains from marketable securities         127,000                    
Amortization period of inventories and supplies         24 months                    
Useful life               3 years   3 years 3 years   7 years 7 years  
Depreciation expense         2,947,000 2,416,000 1,864,000                
Property and equipment payment terms                 24 months     60 months      
Impairment loss on intangible assets         $ 0 $ 0 $ 0                
Three-for-two stock split   three-for-two stock three-for-two stock                        
Stock split ratio   1.5 1.5                        
Common stock dividend paid 50.00%                            
Percentage of reduction of Medicare payments to nursing centers       11.10%                      
Percentage of reduction of Medicare payments to plans and providers                             2.00%
Percentage of revenue from a major client         7.00% 9.00% 11.00%   3.00%     7.00%