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Note 8 - Stock Based Compensation (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		13,000	15,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		0	0
Share Price (in dollars per share)		$ 20.16
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total		$ 1,300,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		4 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		176,326	89,449
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		112,255	110,639
Share Purchase Match Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Matching Percentage of Common Stock Purchased	20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Matching of Common Stock Purchased per Individual Within a Calendar Year	$ 25,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		5,075	20,000
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture		$ 77,000	$ 118,000
Share Purchase Match Program [Member] | Restricted Stock [Member] | An Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)			1,742
Stock Issued During Period, Value, Issued for Services			$ 12,000
Share Purchase Match Program [Member] | Restricted Stock [Member] | Certain Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		111
Stock Issued During Period, Value, Issued for Services		$ 1,100
The 2019 Plan [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				1,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Pursuant to Exercise of Incentive Stock Options (in shares)				1,000,000
The 2019 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Employee or Consultant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				250,000
The 2019 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)				50,000
The 2019 Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		4,964	20,075
The 2019 Plan [Member] | Restricted Stock [Member] | Board of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		51,155	81,943
Stock Issued During Period, Value, Issued for Services		$ 1,000,000.0	$ 539,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		46,191	61,868
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years	3 months
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares)		60,000	25,000
Stock Issued During Period, Value, Issued for Services		$ 1,100,000	$ 179,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years	4 years
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%	50.00%
The 2019 Plan [Member] | Restricted Stock [Member] | An Employee [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		6.25%	6.25%

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- Definition

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+ References

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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

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