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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Revenues:        
Net retail sales $ 80,552 $ 81,870 $ 243,559 $ 249,854
Commercial revenue 1,304 1,322 5,037 2,601
Franchise fees 572 556 1,689 1,407
Total revenues 82,428 83,748 250,285 253,862
Costs and expenses:        
Selling, general and administrative 34,268 33,404 107,760 110,135
Store preopening 488 571 2,000 2,969
Interest expense (income), net 2 (19) (16) (58)
Total costs and expenses 80,264 80,952 246,142 252,037
Income before income taxes 2,164 2,796 4,143 1,825
Income tax expense 723 955 1,470 767
Net income 1,441 1,841 2,673 1,058
Foreign currency translation adjustment 387 (298) 1,104 (2,023)
Comprehensive (loss) income $ 1,828 $ 1,543 $ 3,777 $ (965)
Income per common share:        
Basic (in dollars per share) $ 0.09 $ 0.12 $ 0.17 $ 0.07
Diluted (in dollars per share) $ 0.09 $ 0.11 $ 0.17 $ 0.07
Shares used in computing common per share amounts:        
Basic (in shares) 15,633,290 15,518,115 15,600,184 15,471,759
Diluted (in shares) 15,816,265 15,691,004 15,789,851 15,650,143
Retail [Member]        
Costs and expenses:        
Cost of merchandise sold - retail $ 44,916 $ 46,461 $ 133,686 $ 137,778
Commercial [Member]        
Costs and expenses:        
Cost of merchandise sold - retail $ 590 $ 535 $ 2,712 $ 1,213