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Note 13 - Equity Plans (Details) (USD $)	1 Months Ended	12 Months Ended										0 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Five Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Ten Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Fifteen Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Twenty Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Twenty Five Year Anniversary [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member] Supplemental Employee Retirement Plan, Defined Benefit [Member]	Dec. 31, 2012 Restricted Stock Units (RSUs) [Member] Supplemental Employee Retirement Plan, Defined Benefit [Member]	Jan. 02, 2013 Restricted Stock Units (RSUs) [Member]	Jan. 03, 2012 Restricted Stock Units (RSUs) [Member]	Mar. 02, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2013 Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Match [Member]	Dec. 31, 2013 Common Stock [Member]	Jan. 02, 2013 Common Stock [Member]	Jan. 03, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Mar. 02, 2011 Common Stock [Member]
Note 13 - Equity Plans (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0	11,667	4,168
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)		$ 218,000	$ 56,000
Proceeds from Stock Options Exercised (in Dollars)		86,000	34,000
Deferred Tax Expense from Stock Options Exercised (in Dollars)		83,000	21,000
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										28,341	31,243	1,800	1,800	1,800	81,475	38,214
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period															5 years	1 year
Share Price (in Dollars per share)																			$ 23.41	$ 25.55	$ 23.32	$ 26.91
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		8,500															7,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested (in Dollars)					$ 25,000	$ 50,000	$ 75,000	$ 100,000	$ 100,000							$ 735
Restricted Stock Units, Units, Number Converted		0		0

X

- Definition

Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 20

-Section 55

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907

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X

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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X

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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X

- Definition

Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

+ References

No definition available.

+ Details

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X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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-Paragraph 2

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (d)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

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-Publisher SEC

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-Section 02

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-Article 5

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- Definition

Restricted Stock Units converted to shares.

+ References

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- Definition

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

+ References

No definition available.

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X

- Definition

The number of shares a participant is required to purchase on the open market in order to recieve award.

+ References

No definition available.

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- Definition

The minimum quantity of shares a participant is required to own to participate in compensation program.

+ References

No definition available.

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- Definition

Shares Matched

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