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Note 2 - Stock-based Compensation - Stock Plan Activities (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Options outstanding, stock option awards exercised (in shares)	(193)	(100)
Incentive Plan [Member]
Awards available, beginning balance (in shares)			968
Options outstanding, beginning balance (in shares)			21,050
Weighted average exercise price, beginning balance (in dollars per share)			$ 5.96
Awards, available, Plan amendment (in shares)			8,000
Awards available, Restricted stock unit awards granted (in shares)			(22)
Awards available, Restricted stock unit awards cancelled (in shares)			0
Awards available, stock option awards granted (in shares)			(547)
Options outstanding, stock option awards granted (in shares)			547
Weighted average exercise price, stock option awards granted (in dollars per share)			$ 4.87
Options outstanding, stock option awards exercised (in shares)			(193)
Weighted average exercise price, stock option awards exercised (in dollars per share)			$ 2.76
Awards available, stock option awards cancelled (in shares)			2,495
Options outstanding, stock option awards cancelled (in shares)			(2,495)
Weighted average exercise price, stock option awards cancelled (in dollars per share)			$ 6.66
Awards available, ending balance (in shares)	10,894		10,894
Options outstanding, ending balance (in shares)	18,909		18,909
Weighted average exercise price, ending balance (in dollars per share)	$ 5.85		$ 5.85
Inducement Plan [Member]
Awards available, beginning balance (in shares)			171
Options outstanding, beginning balance (in shares)			1,329
Weighted average exercise price, beginning balance (in dollars per share)			$ 3.60
Awards, available, Plan amendment (in shares)			1,700
Awards available, stock option awards granted (in shares)			(1,502)
Options outstanding, stock option awards granted (in shares)			1,502
Weighted average exercise price, stock option awards granted (in dollars per share)			$ 3.34
Options outstanding, stock option awards exercised (in shares)			0
Weighted average exercise price, stock option awards exercised (in dollars per share)			$ 0
Awards available, stock option awards cancelled (in shares)			145
Options outstanding, stock option awards cancelled (in shares)			(145)
Weighted average exercise price, stock option awards cancelled (in dollars per share)			$ 4.28
Awards available, ending balance (in shares)	514		514
Options outstanding, ending balance (in shares)	2,686		2,686
Weighted average exercise price, ending balance (in dollars per share)	$ 3.42		$ 3.42

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- Definition

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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

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