Represents the common stock ownership percentage by a person or group that makes the rights exercisable.

No definition available.

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- Definition

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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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Face amount or stated value per share of common stock.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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- Definition

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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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Note 11 - Stockholders' Equity (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 07, 2016	Sep. 18, 2015	Aug. 31, 2015	Jun. 06, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 155,606		$ 2,953
Proceeds from Stock Options Exercised	$ 223,404	$ 0	9,920
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	180 days
Allocated Share-based Compensation Expense	$ 0	$ 0	0
Common Stock, Par or Stated Value Per Share	$ 0.0024	$ 0.0024
Stock Repurchase Program, Number of Shares Authorized to be Repurchased	1,150,793			2,200,000	2,200,000	1,200,000
Treasury Stock, Shares, Acquired	0
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 174,314
Restricted Stock [Member] \| Operating Expense [Member]
Allocated Share-based Compensation Expense	$ 239,599	$ 199,870	$ 145,321
2007 Director Non-Qualified Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
Restricted Stock Plan [Member] \| Restricted Stock [Member] \| Executive Officers, Non-employee Directors and Other Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	188,225
Stockholder Rights Plan [Member]
Common Stock, Par or Stated Value Per Share							$ 0.0024
Stockholder Rights Plan [Member] \| Preferred Share Purchase Right [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 30
Class Of Warrant Or Right Exercisable, Condition Common Stock Ownership, Percentage							20.00%