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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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