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Note 9 -Stock Based Compensation (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Option Plan 1995 [Member]
Allocated Share-based Compensation Expense		$ 468,000	$ 380,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 325,000	513,000	266,000
Performance Equity Plan 2000 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,230,000
Share-based Compensation Arrangement, Exercisable Price for Options Granted to President and Specific Persons as Percentage of Closing Price	110.00%
Share-based Compensation Arrangement Percentage of Voting Stock Considered for Higher Exercise Price	10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	113,787
Performance Equity Plan 2009 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	500,000
Maximum [Member] | Non-employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	5 years
Maximum [Member] | Employees Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	10 years
Employees Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
Issue of Stock for Cash and Noncash Consideration [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	10,000
Treasury Stock, Value, Acquired, Cost Method	$ 362,012
Issue of Stock for Noncash Consideration 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	45,000
Treasury Stock, Shares, Acquired	29,648
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	0
Allocated Share-based Compensation Expense	$ 524,000
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options	$ 33,000	$ 86,000	$ 27,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 10.86	$ 8.17
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	55,000	155,000	45,000
Proceeds from Stock Options Exercised	$ 80,000	$ 447,751
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	230,500	679,000	$ 266,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 221,000	$ 387,000	$ 2,472,000

X

- Definition

Options exercisable price as percentage of closing price of the entity's shares for options granted to president and specific persons possessing more than 10% of the total combined voting power of all classes of Company stock, on the date of issuance under share based compensation arrangement.

+ References

No definition available.

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Percentage of the total combined voting power of all classes of stock considered for options exercisable at 110% of the closing price of the entity's shares on the date of issuance.

+ References

No definition available.

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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.

+ References

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-SubTopic 10
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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

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- Definition

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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- Definition

Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Number of share options (or share units) exercised during the current period.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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