Note 4 - Summary of Significant Accounting Policies - Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2020 $ / shares shares
Balance at December 31, 2019 (in shares) | shares	1,911,450
Balance at December 31, 2019 (in AUD per share) | $ / shares	$ 0.46
Granted (in shares) | shares	7,594,000
Granted (in AUD per share) | $ / shares	$ 0.25
Exercised (in shares) | shares	0
Exercised (in AUD per share) | $ / shares	$ 0
Lapsed (in shares) | shares	(12,000)
Lapsed (in AUD per share) | $ / shares	$ 0.79
Balance at September 30, 2020 (in shares) | shares	9,493,450
Balance at September 30, 2020 (in AUD per share) | $ / shares	$ 0.29