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Note 6 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Payment Arrangement, Option [Member]
Stock Options (in shares)	104,292	192,300
Stock Options (in shares)	500	11,425
Restricted Stock [Member]
Equity Instruments Other than Options (in shares)		64,578
Restricted Stock Units (RSUs) [Member]
Equity Instruments Other than Options (in shares)	165,507	8,130
Performance Restricted Stock Units [Member]
Equity Instruments Other than Options (in shares)	114,500
Stock Appreciation Rights (SARs) [Member]
SARs (in shares)

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

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- Definition

Number of non-option equity instruments exercised by participants.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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