Number of options each director received at each annual meeting.

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- Definition

Options vesting percentage on first and second anniversary.

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- Definition

Sharebased compensation arrangement by sharebased payment award number of options ungranted.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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- 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.

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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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- Definition

Gross number of share options (or share units) granted during the period.

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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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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

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Note 14 - Stock Option Plans (Details Textual) - USD ($)	1 Months Ended	12 Months Ended			180 Months Ended
	Aug. 31, 2000	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2003	Dec. 31, 2017	Jun. 30, 2015	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		60,000	12,000		800,320
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		17,000	42,000		1,302,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period		18,000	0		258,680
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		206,500	256,500		206,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number		37,000			37,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term		10 years	10 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 77,000			$ 77,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition		1 year 292 days
Employee Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
Employee Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
The 2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				450,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted							197,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		60,000
The 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						750,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0	30,000
The Directors Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	200,000
Sharebased Compensation Arrangement By Sharebased Payment Award Number Of Options Ungranted	60,000
Number Of Options Each Director Received At Each Annual Meeting	4,000
Options Vesting Percentage On First And Second Anniversary	50.00%
The Directors Plan [Member] \| Non-employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	5,000	5,000
The Directors Plan [Member] \| Other Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		12,000