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Note 10 - Equity Compensation (Detail) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 02, 2010
Dec. 31, 2012
Oct. 02, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Apr. 01, 2012
Apr. 01, 2011
Jun. 30, 2010
Dec. 30, 2012
Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)   1,081,923     1,081,923            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Share INcluded in Available for Grant Transferred From Previous Plan (in Shares)   281,923     281,923            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in Shares)   1,668,975   1,402,575 1,668,975 1,402,575          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized   $ 664,848     $ 664,848            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition         20 months            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)         414,750 6,000          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share)         $ 6.58 $ 6.68          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)           $ 2.45          
Share-based Compensation Remaining Contractual Lives           nine years eleven months          
Share-Based Compensation Valuation Assumptions Expected Forfeiture Rate 3.00%   3.40%       4.10% 3.60% 6.55%    
Stock or Unit Option Plan Expense   638,047   228,200 638,000 228,000          
Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Exercisable Number (in Shares)   703,116     703,116            
Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Exercisable Weighted Average Exercise Price (in Dollars per share)   $ 6.68     $ 6.68            
Share Based Compensation Arrangement By Share Based Payment Award Options Expected To Vest Exercisable Aggregate Intrinsic Value   431,814     431,814            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expected to Vest, Contractual Term         8 years 219 days            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value         2,084 1,960          
Proceeds from Stock Options Exercised         7,815 10,420          
Nonemployee Director Stock Award Number of Shares         5,204 3,244          
Nonemployee Director Stock Award Total Fair Value         36,000 22,000          
Treasury Stock, Shares (in Shares)                   287,537 266,615
Treasury Stock, Value                   2,782,000 2,641,000
Employee Stock Option [Member]
                     
Stock or Unit Option Plan Expense         119,654 100,100          
Treasury Stock [Member]
                     
Treasury Stock, Value, Acquired, Cost Method         $ 140,900 $ 135,500          
Total [Member]
                     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares)   2,400,075     2,400,075            
Maximum [Member]
                     
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)         $ 2.11            
Share-based Compensation Remaining Contractual Lives         nine years eleven months            
Treasury Stock Acquired, Repurchase Authorization           24,000          
Minimum [Member]
                     
Share-based Compensation Remaining Contractual Lives         nine years eight months            
Treasury Stock Acquired, Repurchase Authorization         22,000