Note 8 - Retirement Plans (Tables)

12 Months Ended

Dec. 31, 2015

Capital Accumulation Plan [Member]

Notes Tables

Defined Contribution Plan Disclosures [Table Text Block]

	Year Ended December 31,
	2015				2014				2013
	Shares		Amount		Shares		Amount		Shares		Amount
Matching contributions to the Capital Accumulation Plan		1,898	$	26		2,341	$	25		5,235	$	28

Asset Classets [Member]

Notes Tables

Schedule of Allocation of Plan Assets [Table Text Block]

	Target Range
	Strategic Allocation		Lower Limit		Upper Limit
Asset class:
Equities:
Large cap value		5%		0%		50%
Large cap blend		5%		0%		50%
Large cap growth		5%		0%		50%
Mid-cap blend		15%		0%		40%
Small cap core		5%		0%		25%
Foreign large blend		10%		0%		40%
Emerging markets		10%		0%		25%
Real estate		5%		0%		20%
Fixed Income:
U.S. Treasury inflation protected		5%		0%		25%
Intermediate term bond		10%		0%		50%
Long term government bond		5%		0%		40%
Hight yield bond		10%		0%		25%
Emerging markets bond		10%		0%		20%
Money market taxable		0%		0%		100%

Asset Categories [Member]

Notes Tables

Schedule of Allocation of Plan Assets [Table Text Block]

	As of December 31,
	2015		2014
Asset category:
Insurance general account		26%		28%
Cash management accounts		2%		3%
Equity accounts		54%		64%
Fixed income accounts		14%		5%
Real estate accounts		4%		0%
Total		100%		100%

Schedule of Net Funded Status [Table Text Block]

	December 31,
	2015			2014
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	$	108,006		$	83,533
Service cost		3,130			5,162
Interest cost		4,159			4,106
Actuarial losses		420			16,712
Benefits paid		(1,683	)		(1,507	)
Effect of pension curtailment		(10,833	)		-
Projected benefit obligation at end of year	$	103,199		$	108,006
Change in plan assets:
Fair value of pension plan assets at beginning of year	$	66,813		$	58,063
Actual return on plan assets		(1,034	)		3,940
Company contributions		5,150			6,317
Benefits paid		(1,683	)		(1,507	)
Fair value of pension plan assets at end of year		69,246			66,813
Funded status of pension plan	$	(33,953	)	$	(41,193	)
Amounts recognized in our balance sheets consist of:
Accrued benefit cost	$	(8,994	)	$	(10,057	)
Accumulated other comprehensive loss		(24,959	)		(31,136	)
Net liability recognized	$	(33,953	)	$	(41,193	)

Schedule of Assumptions Used [Table Text Block]

	Year Ended December 31,
	2015			2014
Weighted-average assumptions used to determine net periodic benefit cost for the Gray pension plan:
Discount rate		4.00	%		4.97	%
Expected long-term rate of return on pension plan assets		7.00	%		7.00	%
Estimated rate of increase in compensation levels		5.63	%		5.63	%

	As of December 31,
	2015			2014
Weighted-average assumptions used to determine benefit obligations:
Discount rate		4.31	%		4.00	%
Estimated rate of increase in compensation levels		N/A			5.63	%

Schedule of Net Benefit Costs [Table Text Block]

	Year Ended December 31,
	2015			2014			2013
Components of net periodic pension cost:
Service cost	$	3,130		$	5,162		$	5,165
Interest cost		4,159			4,106			3,553
Expected return on plan assets		(4,782	)		(4,200	)		(3,400	)
Recognized net actuarial loss		1,580			969			3,131
Net periodic pension cost	$	4,087		$	6,037		$	8,449

Schedule of Expected Benefit Payments [Table Text Block]

Years				Amount
	2016		$	2,312
	2017			2,464
	2018			2,646
	2019			2,931
	2020			3,372
2021	-	2025		20,521

Defined Benefit Plan, Fair Value of Plan Assets [Table Text Block]

	As of December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Insurance general account	$	-	$	17,918	$	-	$	17,918
Cash management accounts		1,273		-		-		1,273
Equity accounts		37,621		-		-		37,621
Fixed income accounts		9,924		-		-		9,924
Real estate accounts		2,510		-		-		2,510
Total	$	51,328	$	17,918	$	-	$	69,246

	As of December 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Insurance general account	$	-	$	18,598	$	-	$	18,598
Cash management accounts		-		2,319		-		2,319
Equity accounts		-		42,608		-		42,608
Fixed income account		-		3,288		-		3,288
Total	$	-	$	66,813	$	-	$	66,813