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Note 10 - Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
    Three months ended
September 30,		   Nine months ended
September 30,
(In thousands)   2016   2015   2016   2015
                 
Employee Pension Plan:                                
Interest cost   $ 226     $ 221     $ 678     $ 663  
Amortization of unrecognized loss     201       291       604       872  
Expected return on plan assets     (348 )     (350 )     (1,044 )     (1,050 )
Net employee pension expense   $ 79     $ 162     $ 238     $ 485  
                                 
Outside Director Pension Plan:                                
Service cost   $ 11     $ 11     $ 33     $ 33  
Interest cost     24       24       72       72  
Amortization of unrecognized gain     (21 )     (14 )     (65 )     (42 )
Amortization of past service liability     9       10       30       30  
Net outside director pension expense   $ 23     $ 31     $ 70     $ 93  
                                 
Other Postretirement Benefit Plans:                                
Service cost   $ 90     $ 95     $ 270     $ 285  
Interest cost     80       75       240       225  
Amortization of unrecognized loss     12       30       36       90  
Amortization of past service credit     (22 )     (21 )     (64 )     (64 )
Net other postretirement expense   $ 160     $ 179     $ 482     $ 536