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Note 13 - Share-based Compensation - Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance, shares (in shares)	24,000
Balance, weighted average exercise price (in dollars per share)	$ 24.15
Options granted, shares (in shares)
Options granted, weighted average exercise price (in dollars per share)
Options exercised, shares (in shares)	0	0	0
Options exercised, weighted average exercise price (in dollars per share)
Options canceled, shares (in shares)
Options canceled, weighted average exercise price (in dollars per share)
Balance, shares (in shares)	24,000	24,000
Balance, weighted average exercise price (in dollars per share)	$ 24.15	$ 24.15
Balance, weighted average remaining contractual life (Year)
Balance, aggregate instrinsic value
Exercisable, shares (in shares)	24,000
Exercisable, weighted average exercise price (in dollars per share)	$ 24.15
Exercisable, weighted average remaining contractual life (Year)	1 year 87 days
Exercisable, aggregate instrinsic value

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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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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No definition available.

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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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