Note 8 - Securities Available For Sale (Details) - Securities in a Continuous Unrealized Loss Position (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Other marketable securities:
Number of investments, less than twelve months	6	20
Fair value, less than twelve months	$ 27,928	$ 93,390
Unrealized losses, less than twelve months	(71)	(637)
Number of investments, twelve months and more	3	1
Fair value, twelve months and more	10,299	280
Unrealized losses, twelve months and more	(424)	(420)
Fair value	38,227	93,670
Unrealized losses	(495)	(1,057)
US Government Agencies Debt Securities [Member]
Other marketable securities:
Number of investments, less than twelve months	6	20
Fair value, less than twelve months	27,928	93,390
Unrealized losses, less than twelve months	(71)	(637)
Number of investments, twelve months and more	2	0
Fair value, twelve months and more	9,985	0
Unrealized losses, twelve months and more	(39)	0
Fair value	37,912	93,390
Unrealized losses	(110)	(637)
Corporate Debt Securities [Member]
Other marketable securities:
Number of investments, less than twelve months	0	0
Fair value, less than twelve months	0	0
Unrealized losses, less than twelve months	0	0
Number of investments, twelve months and more	1	1
Fair value, twelve months and more	315	280
Unrealized losses, twelve months and more	(385)	(420)
Fair value	315	280
Unrealized losses	$ (385)	$ (420)