Minimum amount of operating income to meet the performance condition.

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

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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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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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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Net number of share options (or share units) granted during the period.

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Amount of capitalized and expensed compensation cost from equity-based compensation arrangements.

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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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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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Note 10 - Stockholders' Equity (Details Textual) - USD ($)			12 Months Ended
	Oct. 02, 2018	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 18, 2015	Aug. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total			0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Total			$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				155,606
Proceeds from Stock Options Exercised				223,404
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			180 days
Allocated Share-based Compensation Expense, Total		$ 0	$ 0	$ 0		$ 0
Stock Repurchase Program, Number of Shares Authorized to be Repurchased			907,406				2,200,000	1,200,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			654,000	9,005
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total			$ 3,315,366
Restricted Stock [Member] \| Operating Expense [Member]
Allocated Share-based Compensation Expense, Total			327,629	$ 239,599	$ 199,870
Restricted Stock [Member] \| Janet Carr [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost, Total			$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	644,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	460,000
Restricted Stock [Member] \| Janet Carr [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	92,000
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Operating Income	$ 12,000,000
Restricted Stock [Member] \| Janet Carr [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	92,000
Share-based Compensation Arrangement by Share-based Payment Award, Minimum Operating Income	$ 14,000,000
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			178,225