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Note 11 - Common Stock and Stock-based Compensation Plans (Details Textual) - USD ($)		9 Months Ended
	Feb. 12, 2024	Sep. 30, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares)		84,025	99,425
Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded	5,344
Chief Operating Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded	4,372
Chief Commercial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded	3,609
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 257,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		2 years 1 month 6 days
Restricted Stock Units (RSUs) [Member] | Vesting on February 16, 2025 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.40%
Restricted Stock Units (RSUs) [Member] | Vesting on February 16, 2026 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.30%
Restricted Stock Units (RSUs) [Member] | Vesting on February 16, 2027 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.30%
Restricted Stock Units (RSUs) [Member] | Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		3 years
Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		2 years
Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		1 year
Short-Term Executive PSUs [Member] | Vesting on February 16, 2025 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.40%
Short-Term Executive PSUs [Member] | Vesting on February 16, 2026 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.30%
Short-Term Executive PSUs [Member] | Vesting on February 16, 2027 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	33.30%
Short-Term Executive PSUs [Member] | Goals One [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	90.00%
Short-Term Executive PSUs [Member] | Goals One [Member] | Full Vesting Based on The Achievement of 2022 License Target [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	50.00%
Short-Term Executive PSUs [Member] | Goals One [Member] | Increase in Eligible PSUs, Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage	2.00%
Short-Term Executive PSUs [Member] | Goals Two [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Short-Term Executive PSUs [Member] | Goals Two [Member] | Increase in Eligible PSUs, Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage	2.00%
Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	90.00%
Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	100.00%
Short-Term Executive PSUs [Member] | Goals Three [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Short-Term Executive PSUs [Member] | Goals Three [Member] | Increase in Eligible PSUs, Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage	2.00%
Short-Term Executive PSUs [Member] | Goals Three [Member] | Full Vesting Based on The Achievement of Positive Shareholder Return [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	25.00%
Short-Term Executive PSUs [Member] | Goals Three [Member] | Vesting Based on Actual Return Being at Least 90 Percent of Russel 2000 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	90.00%
Short-Term Executive PSUs [Member] | Goals Three [Member] | Vesting Based on Actual Return In Excess of 100 Percent of Russel 2000 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	100.00%
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded, Percentage	60.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded	29,986
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member] | Goals One [Member] | Increase in Eligible PSUs, Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage	3.00%
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member] | Goals Two [Member] | Increase in Eligible PSUs, Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage	3.00%
Short-Term Executive PSUs [Member] | Chief Executive Officer [Member] | Goals Three [Member] | Increase in Eligible PSUs, Percent [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Conditional Increase in Shares, Percentage	3.00%
Short-Term Executive PSUs [Member] | CFO, COO, and CCO [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Addtional Shares Issuable, Performance Goals Exceeded, Percentage	40.00%
RSUs and PSUs [Member]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 23,612
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition		1 year 7 months 6 days
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period		859,496
Maximum [Member] | Short-Term Executive PSUs [Member] | Goals One [Member] | Vesting Based on Achievement In Excess of 90 Percent [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	99.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	99.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage	120.00%
Maximum [Member] | Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	99.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	99.00%
Maximum [Member] | Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage	120.00%
Maximum [Member] | Short-Term Executive PSUs [Member] | Goals Three [Member] | Vesting Based on Actual Return Being at Least 90 Percent of Russel 2000 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	99.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	99.00%
Maximum [Member] | Short-Term Executive PSUs [Member] | Goals Three [Member] | Vesting Based on Actual Return In Excess of 100 Percent of Russel 2000 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage	120.00%
Minimum [Member] | Short-Term Executive PSUs [Member] | Goals One [Member] | Vesting Based on Achievement In Excess of 90 Percent [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	91.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage	1.00%
Minimum [Member] | Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return Being at Least 90 Percent of S&P500 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	91.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	90.00%
Minimum [Member] | Short-Term Executive PSUs [Member] | Goals Two [Member] | Vesting Based on Actual Return In Excess of 100 Percent of S&P500 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage	1.00%
Minimum [Member] | Short-Term Executive PSUs [Member] | Goals Three [Member] | Vesting Based on Actual Return Being at Least 90 Percent of Russel 2000 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	91.00%
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Threshold, Percentage	90.00%
Minimum [Member] | Short-Term Executive PSUs [Member] | Goals Three [Member] | Vesting Based on Actual Return In Excess of 100 Percent of Russel 2000 Index [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Actual Performance Results, in Excess of Performance Threshold, Percentage	1.00%
The2011 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights Vesting Percentage, Year One		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Remaining Vesting Period		36 months
The2011 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Non-employee Director [Member] | Vesting After the First Anniversary Grant Date [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage	50.00%
The2011 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	33,318
The2011 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	20,043
The2011 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Chief Operating Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	16,399
The2011 Stock Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Chief Commercial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	13,535
The2011 Stock Incentive Plan [Member] | Performance Share Units [Member] | Chief Executive Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	49,978
The2011 Stock Incentive Plan [Member] | Performance Share Units [Member] | Chief Financial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	13,362
The2011 Stock Incentive Plan [Member] | Performance Share Units [Member] | Chief Operating Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	10,932
The2011 Stock Incentive Plan [Member] | Performance Share Units [Member] | Chief Commercial Officer [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period	9,023
The2011 Stock Incentive Plan [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period		4 years
Share-Based Payment Arrangement, Employee [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number (in shares)		0	0

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+ References

No definition available.

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+ References

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