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Note D - Stock-based Compensation (Details Textual) - USD ($)			3 Months Ended				9 Months Ended
		Mar. 02, 2006	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Mar. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 29, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value							$ 186,000	$ 202,000
Allocated Share-based Compensation Expense					$ 56,000		$ 446,000	$ 251,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Basic			$ 0.02		$ 0.01		$ 0.05	$ 0.03
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 1,501,000		$ 290,000		$ 1,501,000	$ 290,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share, Diluted			$ 0.02				$ 0.05	$ 0.02
Share Price									$ 23.93
Proceeds from Stock Options Exercised							$ 122,000	$ 74,000
Amortization, Current Year [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 168,000				168,000
Amortization Year 2 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			644,000				644,000
Amortization, Year 3 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			552,000				552,000
Amortization, Year 4 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 137,000				$ 137,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							104,298
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]						$ 16.38
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] | 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] | Stock Award [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							100,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Grant Date Fair Value			$ 16.38				$ 16.38
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							3 years
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Chief Executive Officer [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage							33.00%
The 2014 Stock Option Plan [Member] | Stock Award [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							33.00%
The 2014 Stock Option Plan [Member] | Stock Award [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							33.00%
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							33.00%
[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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