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Note 11 - Capital Stock and Stock-based Compensation - Stock Option and Restricted Stock Unit Activity (Details)	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Opening Balance, Stock Options Outstanding (in shares) | shares	2,266,122
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 3.93
Options, Granted in Period (in shares) | shares	42,373
Options, Granted in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 2.58
Options, Cancelled / Forfeited in Period (in shares) | shares	(49,074)
Options, Cancelled / Forfeited, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 3.81
Opening Balance, Stock Options Outstanding (in shares) | shares	2,259,421
Options, Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares	$ 3.90
Restricted Stock Units (RSUs) [Member]
Restricted Stock Units Outstanding , Balance (in shares) | shares	1,590,450
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 2.27
Restricted Stock Units, Granted in Period (in shares) | shares	142,766
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 3
Restricted Stock Units, Vested in Period (in shares) | shares	(267,588)
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 2.75
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | shares	(31,795)
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 3.02
Restricted Stock Units Outstanding , Balance (in shares) | shares	1,433,833
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 2.24
Market Condition Restricted Stock Units [Member]
Restricted Stock Units Outstanding , Balance (in shares) | shares	529,491
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 1.67
Restricted Stock Units, Granted in Period (in shares) | shares
Restricted Stock Units Granted , Grant Date Fair Value, Balance (in dollars per share) | $ / shares
Restricted Stock Units, Vested in Period (in shares) | shares
Restricted Stock Units, Vested , Grant Date Fair Value, Balance (in dollars per share) | $ / shares
Restricted Stock Units, Cancelled / Forfeited in Period (in shares) | shares
Restricted Stock Units, Cancelled/ Forfeited , Grant Date Fair Value, Balance (in dollars per share) | $ / shares
Restricted Stock Units Outstanding , Balance (in shares) | shares	529,491
Restricted Stock Units Outstanding , Grant Date Fair Value, Balance (in dollars per share) | $ / shares	$ 1.67

X

- Definition

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

+ 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=120381028&loc=d3e5070-113901

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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

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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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- Definition

For presentations that combine terminations, 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 or that expired.

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

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

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