Note 7 - Other Assets (Details Textual)	12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 NZD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 NZD ($)	Jun. 30, 2019 USD ($)
Other Assets, Current				$ 603,944		$ 546,105
Available-for-sale Securities, Total				1,800,000		3,800,000
Restricted Cash and Cash Equivalents, Total			$ 20,000	12,854	$ 20,000	13,437
Wainwright [Member]
Assets, Noncurrent, Total				523,607
Cost Method Investments				$ 500,000		$ 500,000
Cost Method Investment, Ownership Percentage			10.00%	10.00%	10.00%	10.00%
Cost-method Investments, Other than Temporary Impairment	$ 0	$ 0
Deposit Assets, Total				$ 23,607		$ 23,607