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Note 6 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2022
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Risk-free interest rates

    1.3%-1.6 %

Expected life (in years)

    2-5.75  

Dividend yield

    0.67 %

Expected volatility (weighted average)

    32.8%-46.1 %