Note 5 - Leases (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Dec. 31, 2018 USD ($) ft²	Aug. 30, 2020 USD ($)	Aug. 30, 2020 USD ($)
Operating Lease, Expense		$ 40	$ 80
Operating Lease, Payments		$ 76	$ 76
Operating Lease, Weighted Average Remaining Lease Term (Year)		6 years 36 days	6 years 36 days
Additional Manufacturing Facility [Member]
Area of Land (Square Foot) | ft²	90,000
Construction in Progress Estimated Cost	$ 18,000
Purchase Obligation, Total		$ 960	$ 960
Construction in Progress, Gross		11,198	11,198
Accounts Payable and Accrued Liabilities [Member]
Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year		$ 66	$ 66
Minimum [Member]
Lessee, Operating Lease, Renewal Term (Year)		1 year	1 year
Maximum [Member]
Lessee, Operating Lease, Renewal Term (Year)		10 years	10 years