Annual report pursuant to Section 13 and 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Summary of Store Activity (Details)

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Nature of Operations and Summary of Significant Accounting Policies - Summary of Store Activity (Details) - Store
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Franchised Stores [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Stores, beginning of year 117 109
Stores opened during the year 9 15
Stores transferred/sold to the Company (2) 0
Stores closed during the year (22) (7)
Stores, end of year 102 117
Company-owned Stores [Member]    
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]    
Stores, beginning of year 13 11
Stores opened during the year 2 3
Stores transferred/sold to the Company 2 0
Stores closed during the year   (1)
Stores, end of year 17 13