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Note D - Stock-based Compensation (Details Textual) - USD ($)			3 Months Ended
		Mar. 02, 2006	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			$ 109,000	$ 109,000
Allocated Share-based Compensation Expense			$ 115,000	$ 149,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted			$ 0.01	$ 0.01
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 194,000	$ 393,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic			$ 0.01	$ 0.02
Share Price			$ 16.29
Proceeds from Stock Options Exercised			$ 46,000	$ 74,000
Amortization, Current Year [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			90,000
Amortization Year 2 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			98,000
Amortization, Year 3 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 6,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			4,298
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 16.29
Nonqualified Options [Member] | Annual Grant to Non-employee [Member]
Allocated Share-based Compensation Expense			$ 70,000	$ 70,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period			614	325
The 2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		750,000
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			4,298
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 16.29
The 2014 Stock Option Plan [Member] | Minimum [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%
The 2014 Stock Option Plan [Member] | Minimum [Member] | Nonqualified Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			5 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			20.00%
The 2014 Stock Option Plan [Member] | Maximum [Member] | Nonqualified Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
[1] The weighted-average grant date fair value was based on the closing price of the Company's stock on the date of the grant.

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-SubTopic 10
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