Note 10 - Retirement and Postretirement Plans (Details) - Changes in Plans' Benefit Obligations (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
Change in benefit obligation:
Benefit obligation at beginning of year	$ 14,941	$ 13,967
Merger transaction	473,296
Service cost	170	150	150
Interest cost	3,312	615	667
Actuarial (gain) loss	(430)	1,151
Benefit payments	(3,060)	(942)
Benefit obligation at end of year	488,229	14,941	13,967
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member]
Change in benefit obligation:
Merger transaction	24,847
Service cost	11
Interest cost	134
Participant contributions	23
Actuarial (gain) loss	(174)
Benefit payments	(94)
Benefit obligation at end of year	$ 24,747