Note 1 - Business Activity and Summary of Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2025	Sep. 30, 2024
Total revenues	$ 5,582	$ 5,252
Transferred at Point in Time [Member] \| Equipment Upon Delivery [Member]
Total revenues	5,546	5,194
Transferred at Point in Time [Member] \| Installation [Member]
Total revenues	23	44
Transferred over Time [Member]
Total revenues	$ 13	$ 14

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