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Note 5 - Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares
Sep. 30, 2025
Dec. 31, 2024
Apr. 16, 2019
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Options, Outstanding, Number (in shares) 508,875 588,385  
Total (in shares) 7,116,760    
Restricted Stock Units (RSUs) [Member]      
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Equity Instruments Other than Options, Nonvested, Number (in shares) 302,720 320,411  
Performance Shares [Member]      
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Equity Instruments Other than Options, Nonvested, Number (in shares) 502,246 460,450  
Equity Incentive Plan 2019 [Member]      
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Options, Outstanding, Number (in shares) 508,875    
Number of Shares Authorized (in shares) 4,221,675   2,400,000
Equity Incentive Plan 2019 [Member] | Restricted Stock Units (RSUs) [Member]      
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Equity Instruments Other than Options, Nonvested, Number (in shares) 302,720    
Equity Incentive Plan 2019 [Member] | Performance Shares [Member]      
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Equity Instruments Other than Options, Nonvested, Number (in shares) 502,246    
Employee Stock Purchase Plan 2019 [Member]      
Schedule Of Capital Reserved For Future Issuance [Line Items]      
Number of Shares Authorized (in shares) 1,581,244