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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 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	$ 669	$ 621
Amortization of unrecognized (gain) loss	190	306	570	918
Expected return on plan assets	(336)	(315)	(1,008)	(945)
Net expense	77	198	231	594
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	39	63
Interest cost	29	24	87	72
Amortization of unrecognized (gain) loss	(15)	(9)	(45)	(27)
Amortization of past service liability (credit)	10	9	30	27
Net expense	37	45	111	135
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	270	336
Interest cost	63	55	189	165
Amortization of unrecognized (gain) loss		12		36
Amortization of past service liability (credit)	(22)	(20)	(67)	(60)
Net expense	$ 131	$ 159	$ 392	$ 477