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CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Operations:      
Net investment income $ 2,544 $ 1,804 $ 2,091
Net realized gain on investments 10,578 38,885 826
Net increase in unrealized appreciation of investments 78,635 12,999 70,624
Increase in net assets from operations 91,757 53,688 73,541
Distributions from:      
Undistributed net investment income (3,003) (2,994) (2,993)
Net realized gains deemed distributed to shareholders (3,216) (45,748) (868)
Capital share transactions:      
Allocated increase in share value for deemed distribution 3,216 45,748 868
Change in pension plan funded status (430) (89) 440
Exercise of employee stock options 99 745 0
Stock option expense 1,050 957 675
Increase in net assets 89,473 52,307 71,663
Net assets, beginning of period 539,233 486,926 415,263
Net assets, end of period $ 628,706 $ 539,233 $ 486,926