Note 1 - General Information (Details Textual)	Sep. 30, 2023 $ / shares	Jun. 30, 2023 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Number of Patents Granted	18
Number of Wholly Owned Subsidiaries	3
Number of Locations using TRACER 1000	29

Face amount or stated value per share of common stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant