Note 8 - Employee Benefit Plans (Details) - Defined Benefit Plan Activity (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets
Fair value of plan assets at beginning of year	$ 16,605
Fair value of plan assets at end of year	17,130	16,605
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net (gain) loss	1,066	(1,898)	752
Amortization of prior service cost	71	66	66
Pension Plan [Member]
Change in benefit obligation
Projected benefit obligation at beginning of year	17,185	18,054	15,808
Service cost	524	596	468
Interest cost	663	617	738
Actuarial (gain) loss	1,674	(1,149)	1,554
Benefits paid	(722)	(933)	(514)
Projected benefit obligation at end of year	19,324	17,185	18,054
Change in plan assets
Fair value of plan assets at beginning of year	16,605	14,325	13,326
Actual return on plan assets	884	2,225	963
Employer contribution	363	988	550
Benefits paid	(722)	(933)	(514)
Fair value of plan assets at end of year	17,130	16,605	14,325
Funded status at the end of the year	(2,194)	(580)	(3,729)
Amounts recognized in the Consolidated Balance Sheet
Deferred tax asset	768	203	1,305
Other liabilities	(2,194)	(580)	(3,729)
Total amounts recognized in the Consolidated Balance Sheet	(1,426)	(377)	(2,424)
Amounts recognized in accumulated other comprehensive (loss), net
Net loss	(6,922)	(5,282)	(8,202)
Prior service cost	669	779	879
Deferred tax asset	2,163	1,550	2,538
Amount recognized	(4,090)	(2,953)	(4,785)
Accrued/Prepaid benefit cost, net
Benefit obligation	(19,324)	(17,185)	(18,054)
Fair value of assets	17,130	16,605	14,325
Unrecognized net actuarial loss	6,922	5,282	8,202
Unrecognized prior service cost	(669)	(779)	(879)
Deferred tax liability	(1,395)	(1,347)	(1,233)
Prepaid benefit cost included in other liabilities	2,664	2,576	2,361
Components of net periodic benefit cost
Service cost	524	596	468
Interest cost	663	617	738
Expected return on plan assets	(1,112)	(984)	(1,075)
Amortization of prior service cost	(110)	(101)	(101)
Recognized net actuarial loss	262	532	508
Net periodic benefit cost	227	660	538
Other changes in plan assets and benefit obligations recognized in other comprehensive loss
Net (gain) loss	1,640	(2,921)	1,157
Amortization of prior service cost	110	101	101
Deferred income tax expense (benefit)	(612)	987	(440)
Total recognized	1,138	(1,833)	818
Total recognized in net periodic benefit cost and other comprehensive loss	$ 1,977	$ (2,160)	$ 1,796
Weighted average assumptions at end of the year
Discount rate used for net periodic pension cost	4.50%	3.75%	4.50%
Discount rate used for disclosure	3.75%	4.50%	3.75%
Expected return on plan assets	7.50%	7.50%	8.00%
Rate of compensation increase	3.00%	3.00%	3.00%