Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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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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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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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 3 - Stock-based Compensation and Shareholders' Equity (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
The 1998 Plan [Member] \| Employee Stock Option [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			180 days
The 1998 Plan [Member] \| Employee Stock Option [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
The 1998 Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			3 years
The 1998 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	0		0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	220,500		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 2015 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	23,500		23,500
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000		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
The 2005 Plan [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			5 years
The 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	55,170		55,170
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			63,980
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized			200,000
Allocated Share-based Compensation Expense	$ 26,000	$ 25,000	$ 42,000	$ 46,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	78,670	85,075	78,670	85,075	82,875	88,375
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 120,000		$ 120,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition			2 years 240 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			23,500	21,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			17,980	11,650
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 3.79	$ 4.38