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Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Outstanding, shares (in Shares)	31,949	46,451	58,581
Outstanding, average exercise price	$ 25.03	$ 27.90	$ 28.38
Exercisable, shares (in Shares)	31,949	46,451
Exercisable, average exercise price	$ 25.03	$ 27.90
Granted December 10, 2006 [Member]
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Exercise price	$ 40.24
Outstanding, shares (in Shares)	2,625
Outstanding, contractual average life	343 days
Outstanding, average exercise price	$ 40.24
Exercisable, shares (in Shares)	2,625
Exercisable, average exercise price	$ 40.24
Granted May 16, 2007 [Member]
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Exercise price	$ 37.48
Outstanding, shares (in Shares)	1,337
Outstanding, contractual average life	1 year 135 days
Outstanding, average exercise price	$ 37.48
Exercisable, shares (in Shares)	1,337
Exercisable, average exercise price	$ 37.48
Granted December 10, 2007 [Member]
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Exercise price	$ 37.00
Outstanding, shares (in Shares)	1,950
Outstanding, contractual average life	1 year 343 days
Outstanding, average exercise price	$ 37.00
Exercisable, shares (in Shares)	1,950
Exercisable, average exercise price	$ 37.00
Granted January 2, 2008 [Member]
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Exercise price	$ 36.25
Outstanding, shares (in Shares)	1,337
Outstanding, contractual average life	2 years
Outstanding, average exercise price	$ 36.25
Exercisable, shares (in Shares)	1,337
Exercisable, average exercise price	$ 36.25
Granted November 10, 2008 [Member]
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Exercise price	$ 23.00
Outstanding, shares (in Shares)	16,500
Outstanding, contractual average life	2 years 313 days
Outstanding, average exercise price	$ 23.00
Exercisable, shares (in Shares)	16,500
Exercisable, average exercise price	$ 23.00
Granted May 9, 2011 [Member]
Note 14 - Employee Benefits (Details) - Stocks Options Outstanding by Grant Date [Line Items]
Exercise price	$ 17.55
Outstanding, shares (in Shares)	8,200
Outstanding, contractual average life	5 years 127 days
Outstanding, average exercise price	$ 17.55
Exercisable, shares (in Shares)	8,200
Exercisable, average exercise price	$ 17.55

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ 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)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

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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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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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