Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Investments (Details Textual)

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Investments (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Liquidated Investments $ 39,100,000 $ 15,700,000
Gain On Sale Of Liquidated Investments 251,000 626,000
Auction Rate Securities [Member]
   
Held-to-maturity Securities 1,634,000 2,000,000
Marketable Securities, Gain (Loss)   $ 626,000