Note 23 - Stock Options - Stock Options Valuation Assumptions (Details)	12 Months Ended
Jun. 30, 2022	Jun. 30, 2021
Minimum [Member]
Expected volatility	40.89%	40.89%
Risk-free interest rate	0.11%	0.14%
Maximum [Member]
Expected volatility	84.00%	69.03%
Risk-free interest rate	2.35%	2.35%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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