Note 13 - Stock Option Plan (Details) - Stock Option Activity (USD $)	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Option Activity [Abstract]
Outstanding- Number of Options	115,800	128,225	156,275
Outstanding- Weighted average exercise price	$ 23.51	$ 22.72	$ 21.93
Outstanding- Weighted average remaining contractual term	1 year 335 days
Outstanding- Aggregrate intrinsic value	$ 431
Exercisable at December 31, 2013	57,800
Exercisable at December 31, 2013	$ 25.38
Exercisable at December 31, 2013	262 days
Exercisable at December 31, 2013	$ 219
Exercised-Number of options	(29,825)	(32,775)
Exercised-Weighted average exercise price	$ 20.23	$ 17.53
Forfeited-Number of Options	(2,600)	(15,275)
Forfeited-Weighted average exercise price	$ 19.79	$ 23.95
Granted- Number of Options	20,000	20,000
Granted-Weighted average exercise price	$ 23.20	$ 21.35

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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-Topic 718

-SubTopic 10

-Section 50

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Number of share options (or share units) exercised during the current period.

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