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Note D - Stock Based Compensation (Details Textual) - USD ($)			3 Months Ended
		Mar. 02, 2006	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 3015
The 2014 Stock Option Plan [Member] | Stock Award [Member] | Employee-Director [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] | Stock Award [Member] | Employee-Director [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] | Stock Award [Member] | Employee-Director [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] | Employee-Director [Member] | Share-based Compensation Award, Tranche One [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] | Employee-Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			5,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 30.81
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			2,275
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 30.80
The 2014 Stock Option Plan [Member] | Restricted Stock [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent		85.00%
The 2014 Stock Option Plan [Member] | Nonqualified Options [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			20.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			5 years
The 2014 Stock Option Plan [Member] | Nonqualified Options [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
The 2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		750,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			7,275
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	[1]		$ 30.81
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			325	175
Nonqualified Options [Member] | Annual Grant to Employee-Director [Member]
Allocated Share-based Compensation Expense			$ 42,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Grants in Period			5,000
Diluted [Member]
Allocated Share-based Compensation Expense, Impact on Earnings Per Share			$ 0.01
Basic [Member]
Allocated Share-based Compensation Expense, Impact on Earnings Per Share			$ 0.02
Amortization, Next Year [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			$ 146,000
Amortization Year 2 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			139,000
Amortization, Year 3 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			102,000
Amortization, Year 4 [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			6,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			109,000	$ 70,000
Allocated Share-based Compensation Expense			149,000	$ 119,000
Allocated Share-based Compensation Expense, Impact on Earnings Per Share				$ 0.01
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized			393,000		$ 492,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options			$ 74,000	$ 57,000
[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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