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Note 8 - Shareholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Notes Tables  
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]
    

Options Outstanding

  

Options Exercisable

 
    

At December 31, 2021

  

For the Year Ended December 31, 2021

  

At December 31, 2021

  

For the Year Ended December 31, 2021

 

Range of Exercise Price

  

Number Outstanding

  

Aggregate Intrinsic Value

  

Weighted Average Remaining Contractual Life

  

Weighted Average Exercise Price

  

Number Exercisable

  

Aggregate Intrinsic Value

  

Weighted Average Remaining Contractual Life

  

Weighted Average Exercise Price

 
    

(In thousands)

  

(Years)

      

(In thousands)

  

(Years)

     
 400 -455   34  $527   3.8  $42   34  $527   3.8  $42 
 45 - 50   -   -   -   -   -   -   -   - 
 50 - 55   15   67   2.1   53   15   67   2.1   53 
 55 - 60   260   161   7.8   57   83   46   5.1   57 
 60 - 65   316       6.6   62   258       6.5   62 
 65 - 70   168   -   8.1   66   56   -   8   66 
 400 -700   793  $755   7.1   60   446  $640   6.1   60 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

For the Years Ended December 31,

 
  

2021

  

2020

  

2019

 

Expected volatility (1)

  20%  20%  20%

Expected life in years (2)

  4.7   3.5   4.7 

Risk-free interest rate (3)

  0.46%  1.52%  2.67%

Expected dividend yield

  2.79%  2.59%  2.55%

Fair value per award

 $7.50  $8.64  $10.19 
Share-based Payment Arrangement, Option, Activity [Table Text Block]
  

Shares

  

Weighted Average Exercise Price

  

Weighted Average Remaining Contractual Term

 
  

(In thousands)

      

(Years)

 

Outstanding at January 1, 2021

  693  $61.25     

Granted

  193   57.08     

Exercised

  (53)  56.82     

Forfeited or expired

  (40)  62.14     

Outstanding at December 31, 2021

  793   60.48   7.1 

Exercisable at December 31, 2021

  446   60.07   6.1 
Schedule of Nonvested Share Activity [Table Text Block]
  

Shares

  

Weighted Average Grant Date Fair Value

 
  

(In thousands)

     

Nonvested at January 1, 2021

  373  $9.39 

Granted

  193   7.50 

Vested

  (185)  9.61 

Forfeited

  (34)  8.42 

Nonvested at December 31, 2021

  347  $8.31 
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
  

2021

  

2020

 
  

(In thousands)

 

Outstanding at January 1,

  28   27 

Granted

  13   10 

Issued upon vesting

  (9)  (9)

Forfeited

  (2)  - 

Outstanding at December 31,

  30   28