Note 8 - Segment Information and Disaggregated Revenue (Details Textual)	3 Months Ended		15 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021
Number of Reportable Segments			2
Revenue from Contract with Customer, Including Assessed Tax	$ 12,751,000	$ 15,172,000
Europe and Canada [Member]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,220	$ 1,467