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Note 4 - Cash and Cash Equivalents and Short-term Investments (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash, FDIC Insured Amount $ 2,700,000    
Short Term Investments Maturity 90 days    
Available-for-sale Equity Securities, Amortized Cost Basis 48,100,000 44,300,000  
Proceeds from Sale of Available-for-sale Securities 26,661,000 101,415,000 140,493,000
Available-for-sale Securities, Gross Realized Gains   390,000  
Available-for-sale Securities, Gross Realized Losses 0 388,000  
Available-for-sale Securities, Gross Unrealized Gain (Loss) 1,100,000 372,000  
Investment Income, Interest 1,300,000 1,700,000 1,800,000
Cash Equivalents [Member]
      
Available-for-sale Securities, Gross Realized Gains 785,000    
Municipal Bond Securities [Member]
      
Available-for-sale Equity Securities, Amortized Cost Basis 20,500,000 19,400,000  
Majority Owned Joint Ventures [Member]
      
Restricted Cash and Cash Equivalents $ 980,000