Note 8 - Options: Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range (Details)	12 Months Ended
Dec. 31, 2020 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 26.52
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 77.05
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding \| shares	69,036
Weighted Average Remaining Contractual Life (Years)	7.13
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 67.23
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable \| shares	32,786
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 57.15
Range 1
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	26.52
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 58.50
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding \| shares	23,270
Weighted Average Remaining Contractual Life (Years)	4.07
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 49.99
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable \| shares	23,270
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 49.99
Range 2
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	74.64
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 77.05
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding \| shares	45,766
Weighted Average Remaining Contractual Life (Years)	8.68
Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price	$ 76.00
Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable \| shares	9,516
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price	$ 74.64

Represents the Weighted Average Remaining Contractual Life (Years), as of the indicated date.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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://fasb.org/us-gaap/role/ref/legacyRef
-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=120381028&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

+ 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
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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