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Note 9 - Stockholders' Equity and Stock Incentive Plans - Dividends (Details)	6 Months Ended
	Jun. 30, 2019 $ / shares
Dividend Declared Dec 7, 2017 [Member]
Dividends, record date	Dec. 28, 2017
Dividends, payment date	Jan. 15, 2018
Dividends, amount per share (in dollars per share)	$ 0.05
Dividends, declaration date	Dec. 07, 2017
Dividend Declared Mar 2, 2018 [Member]
Dividends, record date	Mar. 16, 2018
Dividends, payment date	Apr. 15, 2018
Dividends, amount per share (in dollars per share)	$ 0.05
Dividends, declaration date	Mar. 02, 2018
Dividend Declared June 8, 2018 [Member]
Dividends, record date	Jun. 29, 2018
Dividends, payment date	Jul. 15, 2018
Dividends, amount per share (in dollars per share)	$ 0.06
Dividends, declaration date	Jun. 08, 2018
Dividend Declared Dec 7, 2018 [Member]
Dividends, record date	Dec. 28, 2018
Dividends, payment date	Jan. 15, 2019
Dividends, amount per share (in dollars per share)	$ 0.06
Dividends, declaration date	Dec. 07, 2018
Dividend Declared Mar 4, 2019 [Member]
Dividends, record date	Mar. 15, 2019
Dividends, payment date	Apr. 15, 2019
Dividends, amount per share (in dollars per share)	$ 0.06
Dividends, declaration date	Mar. 04, 2019
Dividend Declared June 7, 2019 [Member]
Dividends, record date	Jun. 17, 2019
Dividends, payment date	Jul. 15, 2019
Dividends, amount per share (in dollars per share)	$ 0.07
Dividends, declaration date	Jun. 07, 2019

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

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Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

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