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Note 14 - Employee Benefits - Stock Options Outstanding by Grant Date (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Outstanding, shares (in shares)	19,750	29,324	31,949
Outstanding, weighted average exercise price (in dollars per share)	$ 20.94	$ 23.67
Exercisable, December 31 (in shares)	19,750
Exercisable, December 31 (in dollars per share)	$ 20.94
Exercise Price Range 1 [Member]
Exercise price (in dollars per share)	$ 23
Outstanding, shares (in shares)	12,300
Outstanding, contractual average life (Year)	310 days
Outstanding, weighted average exercise price (in dollars per share)	$ 23
Exercisable, December 31 (in shares)	12,300
Exercisable, December 31 (in dollars per share)	$ 23
Exercise Price Range 2 [Member]
Exercise price (in dollars per share)	$ 17.55
Outstanding, shares (in shares)	7,450
Outstanding, contractual average life (Year)	3 years 127 days
Outstanding, weighted average exercise price (in dollars per share)	$ 17.55
Exercisable, December 31 (in shares)	7,450
Exercisable, December 31 (in dollars per share)	$ 17.55
Exercise Price Range 3 [Member]
Exercise price (in dollars per share)
Outstanding, shares (in shares)	19,750
Outstanding, contractual average life (Year)
Outstanding, weighted average exercise price (in dollars per share)
Exercisable, December 31 (in shares)	19,750
Exercisable, December 31 (in dollars per share)

X

- Definition

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=96867065&loc=d3e5070-113901

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X

- Definition

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=96867065&loc=d3e5070-113901

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X

- Definition

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

+ References

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=96867065&loc=d3e5070-113901

Reference 2: 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)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

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

+ References

No definition available.

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- Definition

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
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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