Note 9 - Pension and Other Postretirement Benefit Plans (Details) - Components of Net Expense for Pension and Other Postretirement Benefit Plans (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Employee Pension Plan [Member]
Note 9 - Pension and Other Postretirement Benefit Plans (Details) - Components of Net Expense for Pension and Other Postretirement Benefit Plans [Line Items]
Interest cost	$ 223	$ 207
Amortization of unrecognized (gain) loss	190	306
Expected return on plan assets	(336)	(315)
Net expense	77	198
Outside Director Pension Plan [Member]
Note 9 - Pension and Other Postretirement Benefit Plans (Details) - Components of Net Expense for Pension and Other Postretirement Benefit Plans [Line Items]
Service cost	13	21
Interest cost	29	24
Amortization of unrecognized (gain) loss	(15)	(9)
Amortization of past service liability (credit)	10	9
Net expense	37	45
Other Postretirement Benefit Plans [Member]
Note 9 - Pension and Other Postretirement Benefit Plans (Details) - Components of Net Expense for Pension and Other Postretirement Benefit Plans [Line Items]
Service cost	90	112
Interest cost	63	55
Amortization of unrecognized (gain) loss		12
Amortization of past service liability (credit)	(21)	(20)
Net expense	$ 132	$ 159