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Note 2 - Fair Value Measurements - Summary of Fair Value Measurement Inputs and Valuation Techniques (Details)
Mar. 31, 2025
Measurement Input, Expected Term [Member] | Valuation Technique, Binomial Pricing Model [Member] | The 2025 Note [Member]  
Debt, measurement input 0.7
Measurement Input, Price Volatility [Member] | Valuation Technique, Binomial Pricing Model [Member] | The 2025 Note [Member]  
Debt, measurement input 1.90
Measurement Input, Risk Free Interest Rate [Member] | Valuation Technique, Binomial Pricing Model [Member] | The 2025 Note [Member]  
Debt, measurement input 0.041
Measurement Input, Expected Dividend Rate [Member] | Valuation Technique, Binomial Pricing Model [Member] | The 2025 Note [Member]  
Debt, measurement input 0
Measurement Input, Credit Spread [Member] | Valuation Technique, Binomial Pricing Model [Member] | The 2025 Note [Member]  
Debt, measurement input 0.359
Warrant Liability [Member] | Measurement Input, Expected Term [Member] | Valuation Technique, Black-Scholes-Merton Model [Member]  
Derivative Liability, Measurement Input 4
Warrant Liability [Member] | Measurement Input, Price Volatility [Member] | Valuation Technique, Black-Scholes-Merton Model [Member]  
Derivative Liability, Measurement Input 1.90
Warrant Liability [Member] | Measurement Input, Risk Free Interest Rate [Member] | Valuation Technique, Black-Scholes-Merton Model [Member]  
Derivative Liability, Measurement Input 0.037
Warrant Liability [Member] | Measurement Input, Expected Dividend Rate [Member] | Valuation Technique, Black-Scholes-Merton Model [Member]  
Derivative Liability, Measurement Input 0
Warrant Liability [Member] | Measurement Input, Exercise Price [Member] | Valuation Technique, Black-Scholes-Merton Model [Member]  
Derivative Liability, Measurement Input 2.22