Note 13 - Stock Compensation Plan - Summary of Stock Option Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Options outstanding, number of shares (in shares)	28,831,170	34,434,994
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.17	$ 0.17
Granted, number of shares (in shares)	0	9,127,175
Granted, weighted average exercise price (in dollars per share)		$ 0.17
Exercised, number of shares (in shares)	(243,125)	(5,438,716)
Exercised, weighted average exercise price (in dollars per share)	$ 0.09	$ 0.09
Forfeited, number of shares (in shares)	(8,796,775)	(8,479,583)
Forfeited, weighted average exercise price (in dollars per share)	$ 0.18	$ 0.21
Expired, number of shares (in shares)	(450,158)	(812,700)
Expired, weighted average exercise price (in dollars per share)	$ 0.20	$ 0.29
Options outstanding, number of shares (in shares)	19,341,112	28,831,170
Options outstanding, weighted average exercise price (in dollars per share)	$ 0.17	$ 0.17
Options outstanding, contractual term (Year)	6 years 146 days
Options outstanding, aggregate intrinsic value	$ 118
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	13,455,439
Options exercisable, weighted average exercise price (in dollars per share)	$ 0.18
Options exercisable, contractual term (Year)	5 years 219 days
Options exercisable, aggregate intrinsic value	$ 100
Options unvested, number of shares (in shares)	5,885,673
Options unvested, weighted average exercise price (in dollars per share)	$ 0.16
Options unvested, contractual term (Year)	8 years 73 days
Options unvested, aggregate intrinsic value	$ 18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	17,919,954
Options vested or expected to vest, weighted average exercise price (in dollars per share)	$ 0.17
Options vested or expected to vest, contractual term (Year)	6 years 73 days
Options vested or expected, aggregate intrinsic value	$ 117

The options unvested measured in an aggregate intrinsic value.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are nonvested.

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

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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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 of the plan that expired.

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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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Number of non-vested options outstanding.

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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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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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