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Note 13 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Option [Member]
Grants:
Stock options (in shares)	254,517	199,970
Exercises:
Stock options (in shares)	518,991	284,548
Restricted Stock [Member]
Grants:
Restricted stock grants (in shares)		64,578
Restricted Stock Units (RSUs) [Member]
Grants:
Restricted stock grants (in shares)	189,507	15,457
Performance Restricted Stock Units [Member]
Grants:
Restricted stock grants (in shares)	123,500
Stock Appreciation Rights (SARs) [Member]
Exercises:
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised	35,250

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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).

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Number of non-option equity instruments exercised by participants.

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

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