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Note 8 - Stockholders' Equity and Stock Incentive Plans - Dividends (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares
Dividend Declared May 2, 2017 [Member]
Dividends, record date	Dec. 28, 2018
Dividends, payment date	Jan. 15, 2019
Dividends, amount per share (in dollars per share)	$ 0.06
Dividend Declared Sept 6, 2017 [Member]
Dividends, record date	Mar. 15, 2019
Dividends, payment date	Apr. 15, 2019
Dividends, amount per share (in dollars per share)	$ 0.06
Dividend Declared Dec 7, 2017 [Member]
Dividends, record date	Dec. 27, 2019
Dividends, payment date	Jan. 15, 2020
Dividends, amount per share (in dollars per share)	$ 0.07

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=121583591&loc=d3e4304-108586

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X

- 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=121583591&loc=d3e4304-108586

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X

- Definition

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

+ References

No definition available.

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