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Note 12 - Stock-based Compensation - Stock Option Activity by Exercise Price (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Exercise price (in dollars per share) | $ / shares
Shares under outstanding options (in shares)	45,068
Weighted-average remaining contractual term (Year)	2 years 292 days
Shares under exercisable options (in shares)	45,068
Exercise Price 1 [Member]
Exercise price (in dollars per share) | $ / shares	$ 10.44
Shares under outstanding options (in shares)	15,000
Weighted-average remaining contractual term (Year)	73 days
Shares under exercisable options (in shares)	15,000
Exercise Price 2 [Member]
Exercise price (in dollars per share) | $ / shares	$ 10.90
Shares under outstanding options (in shares)	24,600
Weighted-average remaining contractual term (Year)	4 years 146 days
Shares under exercisable options (in shares)	24,600
Exercise Price 3 [Member]
Exercise price (in dollars per share) | $ / shares	$ 11.22
Shares under outstanding options (in shares)	5,468
Weighted-average remaining contractual term (Year)	2 years 328 days
Shares under exercisable options (in shares)	5,468

X

- Definition

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.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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

Weighted average remaining contractual term of outstanding stock options, 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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