Note 11 - Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2015

Retirement Plan [Member]

Note 11 - Retirement Plans (Tables) [Line Items]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

(In thousands)	2015			2014
Change in Benefit Obligation
Obligation at beginning of year	$	583		$	774
Service cost		15			12
Interest cost		19			22
Actuarial loss (gain)		19			(189	)
Benefit payments		(36	)		(36	)
Obligation at end of year	$	600		$	583

Schedule of Net Benefit Costs [Table Text Block]

(In thousands)	2015			2014
Service cost	$	15		$	12
Interest cost		19			22
Recognized net actuarial gain		-			(4	)
Net periodic benefit cost	$	34		$	30
Major assumptions:
Discount rate used to determine net period benefit cost		3.22	%		4.06	%
Discount rate used to determine benefit obligation at year end		3.39			3.22

Schedule of Expected Benefit Payments [Table Text Block]

(In thousands)	Supplemental Retirement Plan
2016	$	36
2017		36
2018		36
2019		36
2020		62
2021-2025		321
Total	$	527

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

(In thousands)	2015			2014
Unrecognized net actuarial gain	$	(19	)	$	(37	)
Total	$	(19	)	$	(37	)

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

(In thousands)	Supplemental Retirement Plan
Unrecognized net actuarial loss	$	5
Total	$	5

Postretirement Medical Benefits [Member]

Note 11 - Retirement Plans (Tables) [Line Items]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

(In thousands)	2015			2014
Change in Benefit Obligation
Obligation at beginning of year	$	14,792		$	12,588
Service cost		739			482
Interest cost		649			569
Actuarial loss		313			1,422
Participant contributions		129			115
Benefit payments		(418	)		(384	)
Obligation at end of year	$	16,204		$	14,792

Schedule of Net Benefit Costs [Table Text Block]

(In thousands)	2015			2014
Service cost	$	739		$	482
Interest cost		649			569
Recognized prior service cost		51			207
Amortization of net actuarial loss (gain)		42			(63	)
Net periodic benefit cost	$	1,481		$	1,195
Major assumptions:
Discount rate used to determine net periodic benefit cost		3.92	%		4.93	%
Discount rate used to determine benefit obligation as of year end		4.34			3.92
Retiree participation rate (Plan 1)		100.00			100.00
Retiree participation rate (Plan 2)		72.00			72.00

Schedule of Expected Benefit Payments [Table Text Block]

(In thousands)	Postretirement Medical Benefits
2016	$	374
2017		414
2018		445
2019		470
2020		511
2021-2025		3,344
Total	$	5,558

Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

(In thousands)	2015		2014
Unrecognized net actuarial loss	$	566	$	295
Unrecognized prior service cost		125		175
Total	$	691	$	470

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block]

(In thousands)	Postretirement Medical Benefits
Unrecognized prior service cost	$	50
Total	$	50

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

(In thousands)	1% Increase		1% Decrease
Effect on total of service and interest cost components of net periodic postretirement health care benefit cost	$	358	$	(265	)
Effect on accumulated postretirement benefit obligation		3,601		(2,764	)