Note 1 - Business Activity and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Total revenues	$ 17,317	$ 18,147
Transferred at Point in Time [Member] \| Equipment Upon Delivery [Member]
Total revenues	17,140	17,999
Transferred at Point in Time [Member] \| Installation [Member]
Total revenues	131	94
Transferred over Time [Member]
Total revenues	$ 46	$ 54

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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+ Details