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Note 10 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Employee Pension Plan [Member]        
Note 10 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan [Line Items]        
Interest cost $ 221 $ 223 $ 442 $ 446
Amortization of unrecognized gain (loss) 290 190 581 380
Expected return on plan assets (350) (336) (700) (672)
Net pension expense 161 77 323 154
Directors' Plan [Member]        
Note 10 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan [Line Items]        
Service cost 11 13 22 26
Interest cost 24 29 48 58
Amortization of unrecognized gain (loss) (14) (15) (28) (30)
Amortization of past service liability 10 10 20 20
Net pension expense 31 37 62 74
Other Postretirement Benefit Plan [Member]        
Note 10 - Pension and Other Postretirement Benefit Plans (Details) - The Components of the Net Pension Expense for the Retirement Plan [Line Items]        
Service cost 95 90 190 180
Interest cost 75 63 150 126
Amortization of unrecognized gain (loss) 30   60  
Amortization of past service liability (22) (22) (43) (43)
Net pension expense $ 178 $ 131 $ 357 $ 263