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Note 13 - Equity Incentive Plan - Summary of Exercisable Options and SAR's (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Incentive Stock Options [Member]
Exercisable Options and SAR's outstanding (in shares) | shares	115,871
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 22.90
Exercisable Options and SAR's, Weighted Average Remaining Term (Year)	3 years 255 days
Non-qualified Stock Options [Member]
Exercisable Options and SAR's outstanding (in shares) | shares	158,601
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 38.82
Exercisable Options and SAR's, Weighted Average Remaining Term (Year)	5 years 292 days
Performance Shares [Member]
Exercisable Options and SAR's outstanding (in shares) | shares	23,269
Exercisable Options and SAR's, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 46.51
Exercisable Options and SAR's, Weighted Average Remaining Term (Year)	6 years 219 days

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://fasb.org/us-gaap/role/ref/legacyRef
-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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef
-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=116856206&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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