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Note 2 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jan. 02, 2015
Jul. 01, 2014
Jan. 02, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Director [Member] | Restricted Stock Units (RSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 51,349            
Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     36,292        
New Board Member [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   6,772          
Issue of Stock for Noncash Consideration [Member]              
Proceeds from Stock Options Exercised           $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period           45,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Shares Held in Cashless Exercise           29,648  
Stock Issued During Period, Value, Stock Options Exercised           $ 362,012  
Issuance of Stock for Cash [Member]              
Proceeds from Stock Options Exercised           $ 80,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period           10,000  
Proceeds from Stock Options Exercised           $ 80,000 $ 447,751
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       0 0 55,000  
Allocated Share-based Compensation Expense       $ 76,500 $ 145,200 $ 491,500 350,800
Stock Issued During Period, Value, Stock Options Exercised           80,000 447,751
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value           $ 230,500 $ 513,000