Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details Textual)

v3.7.0.1
Stock-Based Compensation (Details Textual)
1 Months Ended 3 Months Ended
Jun. 01, 2015
shares
Mar. 31, 2012
shares
Apr. 01, 2017
USD ($)
$ / shares
shares
Apr. 01, 2017
GBP (£)
shares
Apr. 02, 2016
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Aggregate shares of restricted stock grant     74,000 74,000  
Total unrecognized compensation | $     $ 3,786,000    
Recognized weighted average period (in years)     1 year 6 months 22 days 1 year 6 months 22 days  
Share-based compensation expenses | $     $ 34,000   $ 70,000
Ratio for additional common stock shares issued, under ESPP     16.67% 16.67%  
2012 Director Equity Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Remaining number of shares to be issued     270,000    
Common stock shares for each nonemployee director 250 500      
Fee for the chairs of each Board committee 150.00% 125.00%      
Share-based Goods and Nonemployee Services Transaction, Shares Approved for Issuance     2,000 2,000  
Stock option granted, shares     6,375 6,375 6,875
Share-based compensation expenses under Director's plan | $     $ 226,000   $ 233,000
Maximum [Member] | 2012 Director Equity Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares available for issuance     35,000    
Employee Stock Purchase Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Rate of common stock at market value     85.00% 85.00%  
Employee Stock Purchase Plan and U.K. Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Aggregate shares of restricted stock grant     1,096,875 1,096,875  
Number of shares purchased by employees     6,627 6,627 9,015
Weighted average price | $ / shares     $ 30.96   $ 23.61
Remaining number of shares to be issued     571,665    
Employee Stock Purchase Plan and U.K. Plan [Member] | Minimum [Member] | United States [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares allowed to be purchased by employees | $     $ 25,000    
Employee Stock Purchase Plan and U.K. Plan [Member] | Minimum [Member] | United Kingdom [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares allowed to be purchased by employees | £       £ 1,500  
Allowable employees purchase rate of common stock based on annual salary     10.00% 10.00%  
Equity Incentive Plan (2011 Plan) [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Aggregate shares of restricted stock grant     1,000,000 1,000,000  
Shares available for issuance     453,937    
2001 Restricted Stock Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Restricted stock expense | $     $ 697,000   $ 1,114,000
Nonemployee Director Equity and Deferred Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares available for issuance     168,499