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Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Cash, FDIC Insured Amount $ 1,700,000    
Short-term Investments 0 49,211,000  
Available-for-sale Equity Securities, Amortized Cost Basis   48,100,000  
Proceeds from Sale of Available-for-sale Securities 49,874,000 26,661,000 101,415,000
Available-for-sale Securities, Gross Realized Gains 706,000    
Available-for-sale Securities, Gross Realized Losses 609,000 0  
Available-for-sale Securities, Gross Unrealized Gain (Loss) 0 1,100,000  
Investment Income, Interest 558,000 1,500,000 1,500,000
Municipal Bond Securities [Member]
      
Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Available-for-sale Equity Securities, Amortized Cost Basis   20,500,000  
Majority Owned Joint Ventures [Member]
      
Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Restricted Cash and Cash Equivalents 374,000    
Cash Equivalents [Member]
      
Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Available-for-sale Securities, Gross Realized Gains   785,000  
Fair Value, Inputs, Level 3 [Member]
      
Note 4 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Short-term Investments $ 0 $ 0 $ 0