Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Components of the Net Pension Expense for the Directors’ Plan (Directors' Plan [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Directors' Plan [Member]
Note 12 - Pension and Other Postretirement Benefit Plans (Details) - Components of the Net Pension Expense for the Directors’ Plan [Line Items]
Service cost	$ 54	$ 82	$ 80
Interest cost	116	98	110
Amortization of unrecognized gain	(60)	(36)	(29)
Amortization of past service liability	40	40	40
Net pension expense	150	184	201
Current actuarial gain	(52)	(122)	(44)
Amortization of actuarial gain	60	36	29
Amortization of prior service cost	(40)	(40)	(40)
Total recognized in other comprehensive income	(32)	(126)	(55)
Total recognized in net pension expense and other comprehensive income	$ 118	$ 58	$ 146