Note 9 - Segment Information and Disaggregated Revenue (Details Textual)	3 Months Ended		9 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Number of Reportable Segments			2
Revenue from Contract with Customer, Including Assessed Tax	$ 13,098,000	$ 15,634,000	$ 37,678,000	$ 42,979,000
Europe and Canada [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,188	$ 2,562	$ 6,576	$ 7,139