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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 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	$ 446	$ 414
Amortization of unrecognized (gain) loss	190	306	380	612
Expected return on plan assets	(336)	(315)	(672)	(630)
Net expense	77	198	154	396
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	26	42
Interest cost	29	24	58	48
Amortization of unrecognized (gain) loss	(15)	(9)	(30)	(18)
Amortization of past service liability (credit)	10	9	20	18
Net expense	37	45	74	90
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	180	224
Interest cost	63	55	126	110
Amortization of unrecognized (gain) loss		12		24
Amortization of past service liability (credit)	(22)	(20)	(43)	(40)
Net expense	$ 131	$ 159	$ 263	$ 318