Note 8 - Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	December 31,
	2016			2015
Changes in benefit obligation
Benefit obligation at beginning of year	$	24,790,000		$	25,470,000
Service cost		57,000			48,000
Interest cost		988,000			951,000
Actuarial loss		1,288,000			327,000
Benefits paid		(1,865,000	)		(2,006,000	)
Benefit obligation at end of year		25,258,000			24,790,000
Changes in plan assets
Fair value of plan assets at beginning of year		15,865,000			17,386,000
Actual return on assets		1,291,000			(515,000	)
Employer contributions		500,000			1,000,000
Benefits paid		(1,865,000	)		(2,006,000	)
Fair value of plan assets at end of year		15,791,000			15,865,000
Funded status at end of year	$	(9,467,000	)	$	(8,925,000	)
Amounts recognized in consolidated balance sheet
Long-term pension liability	$	(9,467,000	)	$	(8,925,000	)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss	$	9,819,000		$	10,106,000

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]

	December 31,
	2016			2015
Projected benefit obligation	$	25,258,000		$	24,790,000
Fair value of plan assets		(15,791,000	)		(15,865,000	)
	$	9,467,000		$	8,925,000

Schedule of Net Benefit Costs [Table Text Block]

	2016			2015			2014
Service cost - benefits earned during the period	$	57,000		$	48,000		$	81,000
Interest cost on projected benefit obligation		988,000			951,000			1,001,000
Expected return on plan assets		(1,188,000	)		(1,343,000	)		(1,395,000	)
Recognized actuarial loss		1,027,000			772,000			322,000
Settlement loss		445,000			460,000			208,000
Net periodic pension cost after settlements	$	1,329,000		$	888,000		$	217,000

Schedule of Assumptions Used [Table Text Block]

							Long Term Rate
	Discount Rate						of Return						Salary Scale
	Corp.			Plants			Corp.			Plants			Corp.		Plants
2015		4.19	%		4.09	%		8.00	%		8.00	%		N/A		N/A
2016		4.04	%		3.91	%		8.00	%		8.00	%		N/A		N/A

							Long Term Rate
	Discount Rate						of Return						Salary Scale
	Corp.			Plants			Corp.			Plants			Corp.		Plants
2014		4.82	%		4.66	%		8.00	%		8.00	%		N/A		N/A
2015		3.86	%		3.74	%		8.00	%		8.00	%		N/A		N/A
2016		4.19	%		4.09	%		8.00	%		8.00	%		N/A		N/A

Schedule of Allocation of Plan Assets [Table Text Block]

	Percentage of Plan
	Assets at				Target
	December 31,				Allocation
Investment description	2016		2015		2017
Equity securities		68%		64%		68%
Fixed income		13%		15%		13%
Other		19%		21%		19%
Total		100%		100%		100%

Schedule of Expected Benefit Payments [Table Text Block]

Year			Projected Benefit Payments
	2017		$	2,259,000
	2018		$	1,369,000
	2019		$	1,489,000
	2020		$	2,127,000
	2021		$	1,691,000
2022	-	2026	$	8,059,000