Note 8 - Marketable Securities and Other Investments (Detail)	9 Months Ended
	Sep. 30, 2011 USD ($)	Sep. 30, 2011 AUD	Dec. 31, 2010 USD ($)
Marketable Securities	$ 39,650,000		$ 223,991,000
Available-for-sale Securities, Gross Unrealized Gains	12,900,000
Proceeds from Convertible Debt (in Dollars)	6,900,000	7,000,000
Proceeds from Sale of Available-for-sale Securities, Debt (in Dollars)	169,100,000	165,000,000
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments	$ 900,000