Note 11 - Employee Stock Benefit Plans - Award Expensing and Fair Value Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Total stock compensation expense	$ 3,231	$ 2,827
Total fair value of stock, stock options and RSUs vested	$ 2,808	3,371
Share-based Payment Arrangement, Option [Member]
Weighted average grant date fair value of stock options granted (in dollars per share)	$ 0.80
Intrinsic value of stock options exercised		$ 38
Risk-free interest	2.28%
Expected term (Year)	6 years 182 days
Expected volatility	50.94%
Dividend yield	0.00%
Restricted Stock Units (RSUs) [Member]
Granted, stock and RSUs, weighted average grant date fair value (in dollars per share)	$ 3.37	$ 5.50
Intrinsic value of stock and RSUs vested	$ 1,256	$ 1,230

The fair value of all equity instruments vested in period under share based payment arrangement.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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