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Note 11 - Stock Based Compensation and Other Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
The 2018 Plan [Member]
Covered Shares (in shares)
Weighted- Average Exercise Price (in dollars per share)
Weighted- Average Remaining Contractual Term (Year)	9 years 127 days
Aggregate Intrinsic Value
Granted Shares (in shares)	245,000
Granted, weighted-average exercise price (in dollars per share)	$ 1.23
Exercised/cancelled, covered shares (in shares)
Exercised/cancelled, weighted-average exercise price (in dollars per share)
Forfeited or expired, covered shares (in shares)	10,000
Forfeited or expired, weighted-average exercise price (in dollars per share)
Covered Shares (in shares)	235,000
Weighted- Average Exercise Price (in dollars per share)	$ 1.23
Exercisable, covered shares (in shares)
Exercisable, weighted-average exercise price (in dollars per share)
Exercisable, weighted average remaining contractual term (Year)
Exercisable, aggregate intrinsic value
The 2008 Plan [Member]
Covered Shares (in shares)	3,344,177	3,111,052
Weighted- Average Exercise Price (in dollars per share)	$ 0.96	$ 0.98
Weighted- Average Remaining Contractual Term (Year)	4 years 200 days	5 years 62 days	4 years 270 days
Aggregate Intrinsic Value	$ 103	$ 1,221	$ 678
Granted Shares (in shares)	45,000	943,000
Granted, weighted-average exercise price (in dollars per share)	$ 1.67	$ 105
Exercised/cancelled, covered shares (in shares)	306,750	110,187
Exercised/cancelled, weighted-average exercise price (in dollars per share)	$ 0.40	$ 0.87
Forfeited or expired, covered shares (in shares)	37,500	599,688
Forfeited or expired, weighted-average exercise price (in dollars per share)
Covered Shares (in shares)	3,044,927	3,344,177	3,111,052
Weighted- Average Exercise Price (in dollars per share)	$ 1.01	$ 0.96	$ 0.98
Exercisable, covered shares (in shares)	2,239,677
Exercisable, weighted-average exercise price (in dollars per share)	$ 1
Exercisable, weighted average remaining contractual term (Year)	3 years 54 days
Exercisable, aggregate intrinsic value	$ 103

X

- Definition

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.

+ References

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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

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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- 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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- Definition

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 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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