XML 56 R43.htm IDEA: XBRL DOCUMENT v3.5.0.2
Note 11 - Stock-based Compensation (Details Textual) - USD ($)
9 Months Ended
Mar. 01, 2016
Sep. 02, 2015
Sep. 02, 2014
May 31, 2016
May 31, 2015
The 2007 Plan [Member] | Minimum [Member] | One Year after Date of Grant [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       3 years  
The 2007 Plan [Member] | Maximum [Member] | One Year after Date of Grant [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years  
The 2007 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       800,000  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       53,447 45,067
ESPP [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized       100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent       90.00%  
Employee Stock Option [Member]          
Stock or Unit Option Plan Expense       $ 325,576 $ 378,421
Net of Estimated Forfeitures [Member]          
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year       $ 341,261  
Number of Stock-based Compensation Plans       2  
Stock Issued During Period, Shares, Employee Stock Purchase Plans 3,144 2,439 1,948    
Stock Issued During Period, Shares, Employee Stock Purchase Plans 3,144 2,439 1,948    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       53,447 45,067
Allocated Share-based Compensation Expense, Estimate Remainder of Fiscal Year       $ 101,861  
Allocated Share-based Compensation Expense, Estimate, Next Fiscal Year       159,600  
Allocated Share-based Compensation Expense, Estimate, Fiscal Year Two       $ 79,800  
Estimated Forfeiture Rate for Stock Options       10.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 8.48 $ 11.58
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       6 years 259 days 6 years 204 days