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Note 2 - Stock-based Compensation (Details Textual) - USD ($)			3 Months Ended		6 Months Ended
	Jan. 02, 2015	Jan. 02, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Restricted Stock Units (RSUs) [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	51,349
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		36,292
Issue of Stock for Noncash Consideration [Member]
Proceeds from Stock Options Exercised					$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					45,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Shares Held in Cashless Exercise					29,648
Stock Issued During Period, Value, Stock Options Exercised					$ 362,012
Issuance of Stock for Cash [Member]
Proceeds from Stock Options Exercised					$ 80,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					10,000
Proceeds from Stock Options Exercised					$ 80,000	$ 447,751
Allocated Share-based Compensation Expense			$ 142,000	$ 103,000	$ 415,000	206,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period					55,000
Stock Issued During Period, Value, Stock Options Exercised					$ 80,000	447,751
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 0	$ 99,000	$ 230,500	$ 513,000

X

- Definition

Number of shares held in the cashless exercise of options (or share units) exercised during the current period.

+ References

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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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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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

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Value of stock issued as a result of the exercise of stock options.

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