Note 10 - Share-based Compensation - Stock Option Activity (Details) - USD ($)		12 Months Ended
Nov. 26, 2019	Dec. 31, 2019	Dec. 31, 2018
Stock options outstanding, beginning of period (in shares)		608,547
Balance, weighted average exercise price, beginning of period (in dollars per share)		$ 25.20
Stock options outstanding, weighted average remaining contractual term (Year)		7 years 219 days	7 years 292 days
Stock options outstanding, aggregate intrinsic value
Stock options granted (in shares)	515,036	254,785
Stock options granted, weighted average exercise price (in dollars per share)		$ 5.28
Stock options exercised (in shares)
Stock options exercised, weighted average exercise price (in dollars per share)
Stock options canceled (in shares)		(41,868)
Stock options canceled, weighted average exercise price (in dollars per share)		$ 26.86
Stock options outstanding, end of period (in shares)		821,464	608,547
Balance, weighted average exercise price, end of period (in dollars per share)		$ 18.99	$ 25.20
Exercisable and vested (in shares)		428,793
Exercisable and vested, weighted average exercise price (in dollars per share)		$ 23.62
Exercisable and vested, weighted average remaining contractual term (Year)		6 years 219 days
Exercisable and vested, aggregate intrinsic value

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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