Note 5 - Prepaid expenses (current and noncurrent) (Details)			6 Months Ended		12 Months Ended
	Jun. 22, 2018 USD ($)	Jan. 04, 2017 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Aug. 01, 2018 USD ($)
Note 5 - Prepaid expenses (current and noncurrent) (Details) [Line Items]
Prepaid Expense, Current			$ 1,000,000				$ 1,000,000
Professional and Contract Services Expense			69,005
Increase (Decrease) in Prepaid Expense			0	$ 16,985
Prepaid Expense, Noncurrent			$ 1,000,000				1,000,000
Number of Mines Under MOU	5
Consulting Agreement Service Contract [Member]
Note 5 - Prepaid expenses (current and noncurrent) (Details) [Line Items]
Prepaid Expense, Current						$ 75,263
Deposit Assets								$ 103,508
Consulting and Strategist Agreement [Member]
Note 5 - Prepaid expenses (current and noncurrent) (Details) [Line Items]
Deposit Assets		$ 1,325,000
Contract, Term		6 months
Increase (Decrease) in Prepaid Expense					$ (325,000)
Prepaid Expense, Noncurrent							$ 1,000,000
Number of Mines Under MOU	5
Mine Purchase Price	$ 1,000,000