Note 2 - Investments and Restricted Cash (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Long-term Investments	$ 9,429,000	$ 9,614,000
Tax Basis of Investments, Cost for Income Tax Purposes	10,700,000	8,100,000
Payments to Acquire Available-for-sale Securities, Equity	2,600,000
Restricted Investments	900,000	900,000
Non-Current Investments Held Having Net Gain Position [Member]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	1,900,000
Non-Current Investments Held Having Net Loss Position [Member]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ 600,000