XML 42 R23.htm IDEA: XBRL DOCUMENT v3.23.1
Note 5 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Risk-free interest rates

 3.86%-4.68% 

Expected life (in years)

 2-5.75 

Dividend yield

  0.59  

Expected volatility (weighted average)

 36.0%-42.2%