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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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Number of additional shares authorized for issuance under an established share-based compensation plan.

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

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Number of options outstanding, including both vested and non-vested options.

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Period from grant date that an equity-based award expires, 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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Note 13 - Stock Option Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	73,950	82,875	88,375	115,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	23,500	21,000	20,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	22,700	13,750	20,050
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 83
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	26 months
The 1998 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	220,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	60,244
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	225,058
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	164,814
The 2005 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	50,450
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	65,050
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	184,200
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	68,700
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	200,000
The 2015 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	23,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares)	300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	23,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0
Employee Stock Option [Member] \| The 1998 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Employee Stock Option [Member] \| The 2005 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	5 years
Employee Stock Option [Member] \| Minimum [Member] \| The 1998 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	6 months
Employee Stock Option [Member] \| Maximum [Member] \| The 1998 Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years