Note 6 - Leases (Details Textual) - USD ($)	Jun. 30, 2024	Jun. 30, 2023	May 31, 2023	Mar. 19, 2021	Feb. 28, 2015
Finance Lease, Liability	$ 0	$ 85,000
Operating Lease, Right-of-Use Asset	829,000	2,054,000
Operating Lease, Liability	1,289,000	$ 2,090,000
Office Space And Manufacturing Facilities Grand Prairie Texas [Member]
Operating Lease, Right-of-Use Asset				$ 3,500,000
Lessee, Operating Lease, Discount Rate				6.70%
Operating Lease, Liability				$ 3,500,000
Office Space in Berwyn, Pennsylvania [Member]
Operating Lease, Right-of-Use Asset	$ 500,000
Lessee, Operating Lease, Discount Rate	12.30%
Operating Lease, Undiscounted Minimum Monthly Payment	$ 13,000
Operating Lease, Liability	$ 500,000
Principal Office Denver Colorado [Member]
Operating Lease, Right-of-Use Asset			$ 800,000
Lessee, Operating Lease, Discount Rate			10.30%
Operating Lease, Undiscounted Minimum Monthly Payment			$ 15,500
Operating Lease, Liability			$ 800,000
Lessee, Operating Lease, Term of Contract (Year)			5 years 6 months		5 years