Note 9 - Dividends and Dividend Equivalents (Details) - Quarterly Dividends (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014
Quarterly Dividends [Abstract]
Dividend Declared per Share	$ 0.15us-gaap_DividendsPayableAmountPerShare	$ 0.15us-gaap_DividendsPayableAmountPerShare	$ 0.15us-gaap_DividendsPayableAmountPerShare
Total Amount	$ 5,826us-gaap_DividendsCommonStock	$ 5,823us-gaap_DividendsCommonStock	$ 5,817us-gaap_DividendsCommonStock

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Name:	us-gaap_DividendsCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration