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Note 4 - Stock-based Compensation Plans (Details Textual) - USD ($)		1 Months Ended							6 Months Ended	9 Months Ended
	Jul. 01, 2021	Sep. 30, 2025	Mar. 31, 2025	Feb. 28, 2025	Jan. 31, 2025	Sep. 30, 2024	Apr. 30, 2024	Jan. 31, 2024	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Jul. 10, 2019
Share-based Payment Arrangement, Expense										$ 3,822,000	$ 3,566,000
Non-milestone Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)								60,000
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)										300,000
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		150,000		420,000
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member] | Vesting Net of Taxes Withheld and Paid in Cash [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		25,000		382,477
Performance Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)										10,000
Performance Stock Units [Member] | Share-Based Payment Arrangement, Employee [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		125,000
Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							1,600,000
Chief Executive Officer [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							700,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)							3 years
Chief Executive Officer [Member] | Performance Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							600,000
Chief Executive Officer [Member] | Performance Stock Units [Member] | Vesting Upon Price Hurdle of $13 Per Share [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vesting, Price Hurdle (in dollars per share)							$ 15
Chief Operating Officer [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						275,000
Chief Operating Officer [Member] | Restricted Stock Units (RSUs) [Member] | Vesting Over Period From September 2024 to September 2027 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						137,500
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)						3 years
Chief Operating Officer [Member] | Restricted Stock Units (RSUs) [Member] | Vesting Upon Achievement of Milestones [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						137,500
Consultants [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)				50,000	16,250
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			145,000		150,000
Consultants [Member] | Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			85,000						55,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)				50,000
Consultants [Member] | Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)			60,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)			1 year
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares)				33,750
Two Thousand Nineteen Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)												7,200,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)										5,327,926
Two Thousand Nineteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Yearly [Member]
Salary and Wage, Officer, Excluding Cost of Good and Service Sold	$ 75,000
Share-based Payment Arrangement, Expense	25,000
Two Thousand Nineteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Quarterly [Member]
Salary and Wage, Officer, Excluding Cost of Good and Service Sold	18,750
Share-based Payment Arrangement, Expense	$ 6,250
Two Thousand Nineteen Equity Incentive Plan [Member] | Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)										73,908

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