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Note 9 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Options, outstanding (in shares) | shares	2,266,122
Options, outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.93
Options, granted (in shares) | shares	894,154
Options, granted, weighted average exercise price (in dollars per share) | $ / shares	$ 2.61
Options, exercised (in shares) | shares	(9,994)
Options, exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 2.56
Options, cancelled / forfeited (in shares) | shares	(253,419)
Options, cancelled / forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 3.43
Options, outstanding (in shares) | shares	2,896,863
Options, outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 3.56
Restricted Stock Units (RSUs) [Member]
Restricted stock units, outstanding (in shares) | shares	1,590,450
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ / shares	$ 2.27
Restricted stock units, granted (in shares) | shares	1,001,113
Restricted stock units, granted, grant date fair value (in dollars per share) | $ / shares	$ 2.73
Restricted stock units, vested (in shares) | shares	(748,096)
Restricted stock units, vested, grant date fair value (in dollars per share) | $ / shares	$ 2.34
Restricted stock units, cancelled / forfeited (in shares) | shares	(89,864)
Restricted stock units, cancelled / forfeited, grant date fair value (in dollars per share) | $ / shares	$ 3.27
Market Condition RSU - Performance Factor Adjustment (in shares) | shares	0
Market Condition RSU - Performance Factor Adjustment (in dollars per share) | $ / shares	$ 0
Restricted stock units, outstanding (in shares) | shares	1,753,603
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ / shares	$ 2.46
Market Condition Restricted Stock Units [Member]
Restricted stock units, outstanding (in shares) | shares	529,491
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ / shares	$ 1.67
Restricted stock units, granted (in shares) | shares	332,622
Restricted stock units, granted, grant date fair value (in dollars per share) | $ / shares	$ 2.98
Restricted stock units, vested (in shares) | shares	(233,056)
Restricted stock units, vested, grant date fair value (in dollars per share) | $ / shares	$ 1.47
Restricted stock units, cancelled / forfeited (in shares) | shares	(39,286)
Restricted stock units, cancelled / forfeited, grant date fair value (in dollars per share) | $ / shares	$ 3.03
Market Condition RSU - Performance Factor Adjustment (in shares) | shares	233,055
Market Condition RSU - Performance Factor Adjustment (in dollars per share) | $ / shares	$ 1.47
Restricted stock units, outstanding (in shares) | shares	822,826
Restricted stock units, outstanding, grant date fair value (in dollars per share) | $ / shares	$ 2.13

X

- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were adjusted for performance factors.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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