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Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]            
Cash, FDIC Insured Amount $ 1,000,000     $ 1,000,000    
Available-for-sale Equity Securities, Amortized Cost Basis 20,600,000     20,600,000   48,100,000
Proceeds from Sale of Available-for-sale Securities       28,608,000 14,742,000  
Available-for-sale Securities, Gross Realized Gains       488,000 501,000  
Available-for-sale Securities, Gross Realized Losses     0 5,000    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax     183,000      
Other Comprehensive Income (Loss), Tax       66,000    
Investment Income, Interest 213,000 352,000   442,000 703,000  
Municipal Bond Securities [Member]
            
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]            
Available-for-sale Equity Securities, Amortized Cost Basis 20,600,000     20,600,000   20,500,000
Majority Owned Joint Ventures [Member]
            
Note 2 - Cash and Cash Equivalents and Short-term Investments (Details) [Line Items]            
Restricted Cash and Cash Equivalents $ 566,000     $ 566,000