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Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Cash, FDIC Insured Amount $ 1,100,000    
Short-term Investments 0   0
Proceeds from Sale of Available-for-sale Securities   28,151,000  
Available-for-sale Securities, Gross Realized Gains   500,000  
Available-for-sale Securities, Gross Unrealized Gain (Loss)   600,000  
Other Comprehensive Income (Loss), Tax   (200,000)  
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest   0  
Investment Income, Interest 0 200,000  
Majority Owned Joint Ventures [Member]
      
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]      
Restricted Cash and Cash Equivalents $ 500,000