Note 2 - Significant Accounting Policies (Tables)

6 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	December 31, 2019		December 31, 2018
Warrants		18,784,324		16,305,320
Options		7,801,600		7,152,225
Convertible debt		9,779,000		8,136,018
Convertible preferred stock		18,500		17,500

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three months ended December 31, 2019			Three months ended December 31, 2018			Six months ended December 31, 2019			Six months ended December 31, 2018
Shares issued – beginning of period		28,417,602			26,996,148			28,068,688			25,939,892
Shares held by subsidiaries (Note 8)		(704,309	)		(704,309	)		(704,309	)		(704,309	)
Shares outstanding – beginning of period		27,713,293			26,291,839			27,364,379			25,235,583
Weighted average shares issued during the period		1,090,714			90,939			771,030			785,681
Diluted weighted average shares – end of period		28,804,007			26,382,778			28,135,409			26,021,264