Note 12 - Equity Incentive Plan - Granted and Exercised Stock-based Compensation Awards (Details) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Payment Arrangement, Option [Member]
Grants (in shares)	106,438	27,325	317,213	131,617
Exercises (in shares)	2,146	22,400	2,146	22,900
Forfeitures (in shares)	20,625		54,103
Expirations (in shares)	200		563
Restricted Stock Units (RSUs) [Member]
Grants (in shares)	83,476	8,000	184,107	173,507
Forfeitures (in shares)	8,483		72,166
Performance Restricted Stock Units [Member]
Grants (in shares)	88,820	0	146,220	114,500
Forfeitures (in shares)	8,000		71,000
Total Shareholder Return ("TSRs") Options [Member]
Grants (in shares)	104,638
Grants (in shares)			104,638
Restricted Stock [Member]
Forfeitures (in shares)	0		8,574

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

+ References

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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No definition available.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 718
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