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Note 5 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) Milestone $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Jul. 31, 2025 USD ($)	Apr. 16, 2019 shares
Equity [Line Items]
Preferred Stock, Shares Authorized (in shares)	5,000,000	5,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Preferred Stock, Shares Issued (in shares)	0	0
Common Stock, Shares Authorized (in shares)	500,000,000	500,000,000
Common Stock, Shares, Issued (in shares)	26,494,524	26,529,402
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001
Additional Paid in Capital | $	$ 516.4	$ 493.7
Number of Stock Price Milestones Achieved | Milestone	4
Number Of Additional Stock Price Milestones Achieved | Milestone	2
Issuance of common stock via employee stock purchase plan (in shares)	12,426
Treasury Stock, Shares, Acquired (in shares)	308,417
Treasury Stock, Value, Acquired, Cost Method | $	$ 37.3
Preferred Stock, Shares Outstanding (in shares)	0	0
Common Stock, Shares, Outstanding (in shares)	26,494,524	26,529,402
Share repurchase program, authorized, amount | $			$ 150.0
Average price per share | $ / shares	$ 120.85
Authorized amount available for future repurchases | $	$ 112.7
Employee Stock Option [Member]
Equity [Line Items]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 month 6 days
Employee Stock Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Minimum [Member]
Equity [Line Items]
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%
Employee Stock Option [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Maximum [Member]
Equity [Line Items]
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]
Equity [Line Items]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 7 months 6 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $	$ 20.0
Restricted Stock Units (RSUs) [Member] | Minimum [Member]
Equity [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	1 year
Restricted Stock Units (RSUs) [Member] | Maximum [Member]
Equity [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)	5 years
Performance Shares [Member]
Equity [Line Items]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 1 month 6 days
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $	$ 10.9
Predetermined Performance Achievement, Percentage	100.00%
Performance Shares [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Equity [Line Items]
Number of Days, Achievement of Milestone Stock Price | Milestone	30
Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year)	5 years
Performance Shares [Member] | Share-Based Payment Arrangement, Tranche Two [Member]
Equity [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Service Period (Year)		3 years
Employee Stock [Member]
Equity [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)				240,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Available for Issuance, Authorized Annual Increase, Maximum (in shares)				240,000
Equity Incentive Plan 2019 [Member]
Equity [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	4,221,675			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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