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Note 6 - Financial Instruments and Fair Value (Detail) (USD $)	12 Months Ended
	Dec. 31, 2011	Mar. 31, 2013	Dec. 31, 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		40,900,000
Interest Rate Cash Flow Hedge Liability at Fair Value		$ 1,600,000

X

- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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