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Note 9 - Financial Instruments and Fair Value (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2013 Cash Flow Hedging [Member] Interest Rate Swap [Member]	Dec. 31, 2013 Auction Rate Securities [Member]	Dec. 31, 2012 Auction Rate Securities [Member]
Note 9 - Financial Instruments and Fair Value (Details) [Line Items]
Available-for-sale Securities				$ 6,628,000	$ 6,628,000
Available-for-sale Securities, Amortized Cost Basis				7,575,000	7,575,000
Derivative, Basis Spread on Variable Rate (in Basis Points)				2.25%
Asset Impairment Charges	1,000,000
Derivative Asset, Notional Amount			38,400,000
Interest Rate Cash Flow Hedge Liability at Fair Value		$ 1,000,000

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Nominal or face amount used to calculate payments on the derivative asset.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow hedging instruments.

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