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Note S - Stock Options - Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Range of exercise prices, lower range (in dollars per share)	$ 3.60
Range of exercise prices, upper range (in dollars per share)	$ 39.36
Options outstanding (in shares)	227,274
Options exercisable (in shares)	167,980
Options exercisable, weighted average exercise price (in dollars per share)		$ 20.77
Exercise Price Range 1 [Member]
Range of exercise prices, lower range (in dollars per share)	$ 3.60
Range of exercise prices, upper range (in dollars per share)	$ 5.20
Options outstanding (in shares)	28,065
Options outstanding, weighted average exercise price (in dollars per share)	$ 5.01
Options outstanding, weighted average remaining remaining life (Year)	6 years 244 days
Options exercisable (in shares)	84
Options exercisable, weighted average exercise price (in dollars per share)	$ 4.08
Exercise Price Range 2 [Member]
Range of exercise prices, lower range (in dollars per share)	5.21
Range of exercise prices, upper range (in dollars per share)	$ 15.68
Options outstanding (in shares)	49,919
Options outstanding, weighted average exercise price (in dollars per share)	$ 12.16
Options outstanding, weighted average remaining remaining life (Year)	4 years 299 days
Options exercisable (in shares)	23,814
Options exercisable, weighted average exercise price (in dollars per share)	$ 13.30
Exercise Price Range 3 [Member]
Range of exercise prices, lower range (in dollars per share)	15.69
Range of exercise prices, upper range (in dollars per share)	$ 39.36
Options outstanding (in shares)	149,290
Options outstanding, weighted average exercise price (in dollars per share)	$ 21.80
Options outstanding, weighted average remaining remaining life (Year)	3 years 21 days
Options exercisable (in shares)	144,082
Options exercisable, weighted average exercise price (in dollars per share)	$ 22.01

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=120381028&loc=d3e5070-113901

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- Definition

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

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-Publisher FASB
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- Definition

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.

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-Topic 718
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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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- 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

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X

- Definition

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

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