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Note 7 - Stock Based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	Sep. 30, 2019	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2019
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		13
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance (in shares)		0		0
Share Price (in dollars per share)		$ 12.95
Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		13
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
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
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
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
The 2019 Plan [Member] | Restricted Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		863	394
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 1,300
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		3 years 8 months 12 days
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)		5,174	2,364
Stock Issued During Period, Value, Issued for Services		$ 69	$ 52
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)		4,311	1,970
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)		3 months
The 2019 Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)			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)		5,000	1,261
Stock Issued During Period, Value, Issued for Services		$ 79	$ 20
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Month)		4 years	2 years
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
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		863	1,655
Shares Granted, Value, Share-Based Payment Arrangement, before Forfeiture		$ 12	$ 29

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- Definition

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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