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Note 2 - Cash and Cash Equivalents and Short-term Investments (Detail) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Municipal Bond Securities [Member]
Dec. 31, 2011
Municipal Bond Securities [Member]
Sep. 30, 2012
Majority Owned Joint Ventures [Member]
Sep. 30, 2011
Cash Equivalents [Member]
Cash, FDIC Insured Amount $ 704,000 $ 704,000            
Restricted Cash and Cash Equivalents             3,900,000  
Available-for-sale Equity Securities, Amortized Cost Basis 52,200,000 52,200,000   44,300,000 20,400,000 19,400,000    
Proceeds from Sale of Available-for-sale Securities 7,700,000 22,396,000 84,473,000          
Available-for-sale Securities, Gross Realized Gains 163,000 663,000            
Available-for-sale Securities, Gross Realized Losses 0              
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 1,400,000 1,400,000            
Other Comprehensive Income (Loss), Tax   492,000            
Investment Income, Interest $ 432,000 $ 1,100,000 $ 1,300,000         $ 309,000