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Note 6 - Financial Instruments and Fair Value (Detail) (USD $)
12 Months Ended
Dec. 31, 2011
Sep. 30, 2012
Available-for-sale Securities, Debt Securities, Noncurrent $ 6,628,000 $ 6,628,000
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis   7,600,000
Derivative, Basis Spread on Variable Rate (in Basis Points)   2.25%
Asset Impairment Charges 1,000,000  
Notional Amount of Interest Rate Cash Flow Hedge Derivatives   42,600,000
Interest Rate Cash Flow Hedge Liability at Fair Value $ 2,233,000 $ 2,142,000