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Changes in Stockholders' Equity and Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Changes In Stockholders Equity and Comprehensive Income [Line Items]    
Beginning balance at March 31, 2012: $ 81,181  
Net income 3,952 4,837
Net change in unrealized gain on short term investments 9 46
Ending balance at June 30, 2012: 82,645  
Additional Paid-in Capital
    
Changes In Stockholders Equity and Comprehensive Income [Line Items]    
Beginning balance at March 31, 2012:     
Share based compensation 554  
Dividends declared     
Net income     
Net change in unrealized gain on short term investments     
Ending balance at June 30, 2012: 554  
Accumulated Retained Earnings
    
Changes In Stockholders Equity and Comprehensive Income [Line Items]    
Beginning balance at March 31, 2012: 81,108  
Share based compensation     
Dividends declared (3,051)  
Net income 3,952  
Net change in unrealized gain on short term investments     
Ending balance at June 30, 2012: 82,009  
Accumulated Other Comprehensive Loss
    
Changes In Stockholders Equity and Comprehensive Income [Line Items]    
Beginning balance at March 31, 2012: 44  
Share based compensation     
Dividends declared     
Net income     
Net change in unrealized gain on short term investments 9  
Ending balance at June 30, 2012: $ 53