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Note 13 - Stock-based Compensation - Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions (Details) - Stock Incentive Plan 2014 [Member]
12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement, Employee [Member]  
Risk-free interest rate 0.66%
Expected term (in years) (Year) 6 years 3 months
Expected price volatility 89.18%
Dividend yield 0.00%
Non-officer Directors [Member]  
Risk-free interest rate 1.60%
Expected term (in years) (Year) 6 years 3 months
Expected price volatility 97.78%
Dividend yield 0.00%
New Options [Member]  
Risk-free interest rate 3.30%
Expected term (in years) (Year) 2 years 8 months 4 days
Expected price volatility 123.53%
Dividend yield 0.00%