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Investments (Details Textual) (USD $) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2012 | Mar. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 11,148,000 | $ 10,184,000
Investments (Narrative) [Abstract] |  |
Value of investments to be other-than-temporarily impaired | 0 |
Gross gains realized | 31,000 |
Gross losses realized | 1,000 |
Common stock of industrial and other companies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 2,500,000 |
Total unrealized losses | 121,000 |
Common stock of bank trust, insurance, and public utility companies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value | 1,500,000 |
Total unrealized losses | $ 10,000 |

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