Note 9 - Derivative Financial Instruments (Details) - Notional Amounts And Estimated Fair Values Of Interest Rate Derivative Contracts (USD $) In Thousands, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2009	Sep. 30, 2013 Cash Flow Hedging [Member]	Dec. 31, 2012 Cash Flow Hedging [Member]	Sep. 30, 2013 Not Designated as Hedging Instrument [Member]	Dec. 31, 2012 Not Designated as Hedging Instrument [Member]
Note 9 - Derivative Financial Instruments (Details) - Notional Amounts And Estimated Fair Values Of Interest Rate Derivative Contracts [Line Items]
Interest rate derivative contract	$ 15,000	$ 17,500	$ 17,500	$ 17,500	$ 17,500	$ 15,000	$ 15,000
Interest rate derivative contract				$ (1,327)	$ (1,775)	$ 63	$ 41