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Note 16 - Stock Option and Purchase Plans - Summary of Restricted Stock Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Granted (in shares)	197,500
Granted, weighted average grant date fair value (in dollars per share)	$ 3.16
Vested (in shares)	0
Vested, weighted average grant date fair value (in dollars per share)	$ 0
Forfeited (in shares)	0
Forfeited, weighted average grant date fair value (in dollars per share)	$ 0
Nonvested shares, weighted average grant date fair value (in dollars per share)	$ 3.16
Nonvested shares (in shares)	197,500
Nonvested shares, weighted average grant date fair value (in dollars per share)	$ 3.16
Nonvested shares, weighted average remaining term (Year)	5 years 6 months 29 days
Nonvested shares, aggregate intrinsic value	$ 480,000
Restricted Stock [Member]
Novested shares (in shares)	0	324,500
Nonvested shares, weighted average grant date fair value (in dollars per share)	$ 0	$ 1.03
Granted (in shares)		0
Granted, weighted average grant date fair value (in dollars per share)
Vested (in shares)		(324,500)
Vested, weighted average grant date fair value (in dollars per share)		$ 1.03
Forfeited (in shares)		0
Forfeited, weighted average grant date fair value (in dollars per share)
Nonvested shares, weighted average grant date fair value (in dollars per share)		$ 0
Nonvested shares (in shares)		0
Nonvested shares, weighted average grant date fair value (in dollars per share)		$ 0

X

- Definition

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

+ 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)(iv)(3)
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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-Topic 718
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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

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