Note 9 - Leases (Details Textual) $ in Millions	3 Months Ended
	Mar. 30, 2019 USD ($)
Lessee, Operating Lease, Renewal Term	25 years
Finance Lease Right-of-use Asset, Accumulated Amortization	$ 0.1
Lessee, Sublease Income, Receivable, Remainder of Fiscal Year	0.1
Lessee, Sublease Income, Receivable, Year Two	0.1
Lessee, Lease, Not yet Commenced, Amount	$ 0.3
Lessee, Finance Lease, Renewal Term	25 years
Minimum [Member]
Lessee, Lease, Remaining Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Remaining Term of Contract	39 years