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Note 2 - Cash and Cash Equivalents and Short-term Investments (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Cash, FDIC Insured Amount $ 18,400,000 $ 18,400,000    
Available-for-sale Equity Securities, Amortized Cost Basis 48,700,000 48,700,000   44,300,000
Proceeds from Sale of Available-for-sale Securities   14,742,000 58,601,000  
Available-for-sale Securities, Gross Realized Gains   501,000    
Available-for-sale Securities, Gross Realized Losses   0    
Other Comprehensive Income (Loss), Tax   338,000    
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 627,000 627,000    
Investment Income, Interest 352,000 703,000 943,000  
Municipal Bond Securities [Member]
        
Available-for-sale Equity Securities, Amortized Cost Basis 19,700,000 19,700,000   19,400,000
Majority Owned Joint Ventures [Member]
        
Restricted Cash and Cash Equivalents 3,700,000 3,700,000    
Cash Equivalents [Member]
        
Investment Income, Interest     $ 378,000