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Note 5 - Stockholders' Equity (Details Textual) $ in Thousands		3 Months Ended	12 Months Ended
	Jul. 15, 2021	Mar. 31, 2024 USD ($) shares	Dec. 31, 2023	Apr. 30, 2024 USD ($)	Jan. 24, 2022 USD ($)	Apr. 16, 2019 shares
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $		$ 900
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		9 months 18 days
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares) | shares		9,806
Share Repurchase Program, Authorized, Amount | $					$ 100,000
Treasury Stock, Shares, Acquired (in shares) | shares		0
Subsequent Event [Member]
Share Repurchase Program, Authorized, Amount | $				$ 0
Share-Based Payment Arrangement, Option [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)		10 years
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		2 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		4 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage		50.00%
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years 2 months 12 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $		$ 19,100
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)		5 years
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year)			3 years
Performance Shares [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years 4 months 24 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $		$ 11,800
Number of Stock Price Milestones Achieved		0
Predetermined Performance Achievement, Percentage	100.00%
Performance Shares [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year)		5 years
Number of Days, Achievement of Milestone Stock Price		30
Performance Shares [Member] | Share-Based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year)		3 years
Employee Stock [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares						240,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Issuance, Authorized Annual Increase, Maximum (in shares) | shares						240,000
Equity Incentive Plan 2019 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | shares		3,694,726				2,400,000
Share Based Compensation Arrangement By Share Based Payment Award Percentage, Number of Additional Shares Available for Grant						3.00%

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