Note 10 - Leases (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Lessee, Operating Lease, Renewal Term	25 years
Finance Lease Right-of-use Asset, Accumulated Amortization	$ 0.1
Operating Lease, Impairment Loss	0.2
Operating Leases, Rent Expense, Total		$ 4.8	$ 3.6
Lessee, Sublease Income, Receivable, Remainder of Fiscal Year	0.1
Lessee, Sublease Income, Receivable, Year Two	$ 0.1
Minimum [Member]
Lessee, Lease, Remaining Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Remaining Term of Contract	38 years