Marketable Securities (Narratives) (Details) (USD $)	3 Months Ended
Jun. 30, 2013 month	Jun. 30, 2012
Marketable Securities [Abstract]
Marketable Securities, Realized Loss, Other than Temporary Impairments, Description	In accordance with ASC Topic 320-10-35-30 “Investments – Debt & Equity Securities – Subsequent Measurement,” the Company reviews its marketable securities for declines in market value that may be considered other-than-temporary. The Company generally considers market value declines to be other-than-temporary if there are declines for a period longer than six months and in excess of 20% of original cost, or when other evidence indicates impairment. We also consider the nature of the underlying investments and other market conditions in making this assessment.
Minimum Decline In Value Of Marketable Securities To Be Called As Other Than Temporaty Impairment Period	6
Minimum Decline In Value Of Marketable Securities To Be Called As Other Than Temporary Impairment Percent	20.00%
Marketable Securities, Realized Gain (Loss)	$ 36,000	$ 83,000

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References+ Details

To the extent it deems necessary, this element represents management's discussion of its reasons for concluding that an "other than temporary" impairment of investments in debt and equity securities has occurred which is related to the charge included in realized loss on investments. The value of investments in marketable securities classified as either available-for-sale or held-to-maturity may decline for various reasons. The following are examples of factors which, individually or in combination, indicate that an "other than temporary" decline has taken place and that a write-down of the carrying value was required: (a) the length of the time and the extent to which the fair value has been less than cost; (b) the financial condition and near-term prospects of the issuer, including any specific events which may influence the operations of the issuer such as changes in technology that may impair the earnings potential of the investment or the discontinuance of a segment of the business that may affect the future earnings potential; or (c) the intent and ability of the holder to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value.

+ References+ Details