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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 1 Months Ended 2 Months Ended 12 Months Ended
Jul. 31, 2011
Mar. 01, 2009
Dec. 31, 2011
months
Dec. 31, 2010
Dec. 31, 2009
Number of service facilities     2,900    
Number of states     47    
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.    
Sale of subsidiary company   $ 1,100,000      
Notes receivable     1,855,000 1,910,000  
Discounted notes receivable     1,828,000 1,846,000  
Marketable securities     31,337,000 43,437,000  
Unrealized holding losses     486,000    
Unrealized gains from marketable securities     421,000    
Amortization period of inventories (in months)     24    
Depreciation expense     $ 2,416,000 $ 1,864,000 $ 1,658,000
Three-for-two stock split     three-for-two stock    
Common stock dividend paid       50.00%  
Percentage of reduction of Medicare payments to nursing centers 11.10%        
Laundry And Linen Equipment Installations [Member]
          
Estimated useful lives, Minimum (in years)     3    
Estimated useful lives, Maximum (in years)     7    
Housekeeping, And Office Furniture And Equipment [Member]
          
Estimated useful lives, Minimum (in years)     3    
Estimated useful lives, Maximum (in years)     7    
Autos And Trucks [Member]
          
Average useful life (in years)     3    
Maximum [Member]
          
Property and equipment payment terms (in months)     60    
Minimum [Member]
          
Property and equipment payment terms (in months)     24