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Note 7 - Stock-based Compensation - Changes in the Number and Weighted-Average Grant-Date Fair Value (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Non-vested stock option awards (in shares) | shares	9,295
Weighted average grant-date fair value (in dollars per share) | $ / shares	$ 4.78
Stock option awards granted (in shares) | shares	5,891
Stock option awards granted (in dollars per share) | $ / shares	$ 2.58
Stock option awards vested (in shares) | shares	(2,794)
Stock option awards vested (in dollars per share) | $ / shares	$ 4.48
Stock option awards forfeited (in shares) | shares	(704)
Stock option awards forfeited (in dollars per share) | $ / shares	$ 4.38
Non-vested stock option awards (in shares) | shares	11,688
Weighted average grant-date fair value (in dollars per share) | $ / shares	$ 3.77

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Period Type:	duration

X

- Definition

Number of non-vested options outstanding.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Weighted average grant-date fair value of non-vested options forfeited.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

+ Details

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X

- Definition

Number of options vested.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant-date fair value of options vested.

+ References

No definition available.

+ Details

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