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COMMITMENTS, CONTINGENCIES AND OTHER MATTERS (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2005 USD ($) | Sep. 30, 2017 USD ($) ft² | Oct. 01, 2016 USD ($) | Nov. 07, 2017 USD ($) | Jun. 14, 2017 USD ($)
Construction contract amount |  |  | $ 1,061,000 |  | $ 880,000
Construction contract amount paid |  | $ 1,272,000 |  |  |
Purchase of construction in progress |  | 2,419,000 |  |  |
Owner's fee |  | $ 150,000 | 150,000 |  |
Leases: |  |  |  |  |
Lease rental sales override, percentage of annual sales |  | 7.30% |  |  |
Building, square footage | ft² |  | 4,120 |  |  |
Sales tax, percentage |  | 6.00% |  |  |
Sublease rental income |  | $ 59,000 | 102,000 |  |
Total future minimum sublease payments |  | 134,000 |  |  |
Total rent expense |  | 3,484,000 | 3,506,000 |  |
Franchise Program: |  |  |  |  |
Fiscal agent, annual fee amount |  | $ 25,000 |  |  |
Royalties, gross restaurant sales |  | 3.00% |  |  |
Royalties, gross package liquor sales |  | 1.00% |  |  |
Royalty revenue |  | $ 661,000 | 606,000 |  |
Current Rib Supplier [Member] |  |  |  |  |
Purchase Commitments: |  |  |  |  |
Purchase commitment, rib supplier |  |  |  | $ 6,208,000 |
Limited Partnership [Member] |  |  |  |  |
Employment Agreement/Bonuses: |  |  |  |  |
Performance bonuses |  | $ 838,000 | 897,000 |  |
Bonus payment expressed as percentage of corporate pre-tax net income before depreciation and amortization in excess of $1,875,000 and the company's share of the pre-tax net income before depreciation and amortization from the restaurants owned by the limited partnerships |  | 10.00% |  |  |
Amount of income at which bonuses begin to accrue |  | $ 1,875,000 |  |  |
Management [Member] |  |  |  |  |
Employment Agreement/Bonuses: |  |  |  |  |
Performance bonuses |  | $ 1,337,000 | 1,497,000 |  |
Bonus payment expressed as percentage of corporate pre-tax net income, plus or minus non-recurring items but before depreciation and amortization in excess of $650,000 |  | 5.25% |  |  |
Chief Executive Officer [Member] |  |  |  |  |
Employment Agreement/Bonuses: |  |  |  |  |
Bonus payment expressed as percentage of corporate pre-tax net income, plus or minus non-recurring items but before depreciation and amortization in excess of $650,000 |  | 14.75% |  |  |
Minimum [Member] |  |  |  |  |
Leases: |  |  |  |  |
Lease rental sales override, percentage of annual sales |  | 3.00% |  |  |
Lease rental sales override for limited partnership, percentage of annual sales |  | 2.00% |  |  |
Sales tax, percentage |  | 6.00% |  |  |
Maximum [Member] |  |  |  |  |
Leases: |  |  |  |  |
Lease rental sales override, percentage of annual sales |  | 4.00% |  |  |
Lease rental sales override for limited partnership, percentage of annual sales |  | 5.50% |  |  |
Sales tax, percentage |  | 7.00% |  |  |
James G. Flanigan [Member] |  |  |  |  |
Franchise Program: |  |  |  |  |
Ownership percentage in franchisee |  | 35.24% |  |  |
Michael B. Flanigan [Member] |  |  |  |  |
Franchise Program: |  |  |  |  |
Ownership percentage in franchisee |  | 35.24% |  |  |
Patrick J. Flanigan [Member] |  |  |  |  |
Franchise Program: |  |  |  |  |
Ownership percentage in franchisee |  | 100.00% |  |  |
Limited partnership, percentage |  | 25.00% |  |  |
Officers and directors [Member] |  |  |  |  |
Franchise Program: |  |  |  |  |
Ownership percentage in franchisee |  | 30.00% |  |  |
Limited partnership, percentage |  | 31.90% |  |  |
James G. Flanigan family [Member] |  |  |  |  |
Franchise Program: |  |  |  |  |
Ownership percentage |  | 60.00% |  |  |
North Miami, Florida [Member] |  |  |  |  |
Construction contract amount |  | $ 1,080,000 |  |  |
Purchase of construction in progress |  | 345,000 |  |  |
Hollywood, Florida [Member] |  |  |  |  |
Construction contract amount |  | 127,000 |  |  |
Hollywood, Florida [Member] | Second agreement [Member] |  |  |  |  |
Construction contract amount |  | 174,000 |  |  |
Deerfield Beach Florida [Member] |  |  |  |  |
Management fee revenue |  | $ 425,000 | $ 442,000 |  |
Deerfield Beach Florida [Member] | Service Agreements [Member] |  |  |  |  |
Payments to acquire management rights | $ 500,000 |  |  |  |
Amortization period of management agreement |  | 10 years |  |  |
Atlanta Georgia [Member] |  |  |  |  |
Franchise Program: |  |  |  |  |
Royalties, gross restaurant sales |  | 10.00% |  |  |

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