Note 2 - Acquisitions (Details Textual)			3 Months Ended								6 Months Ended	8 Months Ended	12 Months Ended
	Mar. 16, 2020 USD ($)	Jan. 29, 2020 USD ($)	Sep. 27, 2020 USD ($)	Jun. 28, 2020 USD ($)	Mar. 29, 2020 USD ($)	Dec. 29, 2019 USD ($)	Sep. 29, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 30, 2018 USD ($)	Sep. 27, 2020 USD ($)	Sep. 27, 2020 USD ($)	Sep. 27, 2020 USD ($)	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)
Number of Real Estate Properties	68
Operating Lease, Annual Rent Payable	$ 8,000,000
Operating Lease, Percentage of Net Sales Proceeds	8.00%
Operating Lease, Right-of-Use Asset	$ 56,226,000		$ 70,933,000				$ 0				$ 70,933,000	$ 70,933,000	$ 70,933,000	$ 0
Operating Lease, Liability, Total			70,951,000								70,951,000	70,951,000	70,951,000
Revenue from Contract with Customer, Including Assessed Tax			191,766,000	$ 182,528,000	$ 121,367,000	$ 122,343,000	123,665,000	$ 127,284,000	$ 122,704,000	$ 136,201,000			618,004,000	509,854,000	$ 543,955,000
Net Income (Loss) Attributable to Parent, Total			(1,784,000)	$ (1,275,000)	$ (5,367,000)	$ 5,320,000	$ 819,000	$ 5,766,000	$ (2,678,000)	$ 10,361,000			(3,106,000)	14,268,000	$ 45,766,000
BHMG [Member]
Payments to Acquire Businesses, Gross	140,000,000	$ 140,000,000
Business Combination, Termination of Contract, Expected Credits	5,425,000
Business Combination, Termination of Contract, Expected Credit, Estimated Pro-rated Fixed Portion	1,245,000
Business Combination, Termination of Contract, Expected Credit, Estimated Pro-rated Variable Portion	4,180,000
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination	3,589,000
Operating Lease, Liability, Total	$ 56,226,000
Revenue from Contract with Customer, Including Assessed Tax			200,751,000
Net Income (Loss) Attributable to Parent, Total			13,166,000
Interest Expense, Net Of Tax			$ 4,744,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets											(1,800,000)
BHMG [Member] | Acquisition-related Costs [Member]
Net Income (Loss) Attributable to Parent, Total													$ 8,973,000	$ (7,693,000)
BHMG [Member] | Advertiser Relationships [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles												(10,820,000)
BHMG [Member] | Advertiser Relationships [Member] | Revision of Prior Period, Adjustment [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles											(10,820,000)
BHMG [Member] | Subscriber Relationships [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles												$ (7,860,000)
BHMG [Member] | Subscriber Relationships [Member] | Revision of Prior Period, Adjustment [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles											$ (7,860,000)