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Note 8 - Equity Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended							0 Months Ended		3 Months Ended
	Dec. 31, 2011	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 Five Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Ten Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Fifteen Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Twenty Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Twenty Five Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Mar. 02, 2014 Restricted Stock Units (RSUs) [Member]	Jan. 02, 2013 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Restricted Stock Units (RSUs) [Member]	Mar. 31, 2014 Match [Member]	Mar. 31, 2013 Match [Member]	Mar. 31, 2014 Common Stock [Member]	Mar. 02, 2014 Common Stock [Member]	Jan. 02, 2013 Common Stock [Member]
Note 8 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		7,000	1,667
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)		$ 103	$ 28
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant														500,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period									2,544	1,800	34,226
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											1 year
Share Price (in Dollars per share)															$ 27.51	$ 23.41
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Number of Shares Per Employee	750
Share-based Compensation Arrangement by Share-based Payment Award, Matching Purchase Requirement	500
Share-based Compensation Arrangement by Share-based Payment Award, Award Match	250
Shares Matched												4,750	6,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)				$ 25	$ 50	$ 75	$ 100	$ 100			$ 709

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Price of a single share of a number of saleable stocks of a company.

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

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Number of shares distributed to participants who purchase the required amount on the open market.

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