Note 6 - Leases (Details Textual)	Mar. 06, 2019 a	Dec. 31, 2022 ft²
BND [Member]
Area Available for Lease (Acre) | a	984
Lessee, Operating Lease, Term of Contract (Year)	30 years
Lessee, Operating Lease, Number of Consecutive Renewal Term	2
Lessee, Operating Lease, Renewal Term (Year)	10 years
Houston, Texas [Member]
Area of Real Estate Property (Square Foot)		33,800
SINGAPORE
Area of Real Estate Property (Square Foot)		2,500