Note 7 - Stockholders' Equity (Details Textual)		3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 01, 2014 $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($)	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2018 shares	Aug. 01, 2018 USD ($) $ / shares shares	Dec. 31, 2017 shares
Common Stock Voting Rights Votes Per Share				1
Shares Held by Subsidiaries						704,309	704,309	704,309		704,309
Stock Issued During Period, Value, Issued for Services | $				$ 45,256
Stock Issued During Period, Shares, CommissionsOnSaleOfUnits				1,028
Shares Issued for Warrant Exercise Commissions | $				$ 514
Proceeds from the Sale of Units | $				792,365	306,997
Adjustments to Additional Paid in Capital, Warrant Issued | $				$ 6,250
Class of Warrant or Right, Outstanding		5,229,188		5,229,188
Weighted Average Exercise Price for Outstanding Warrants | $ / shares		$ 0.95
Weighted Average Remaining Contractual Life for Outstanding Warrants		3 years 292 days
Modification of Warrants | $				$ 163,026
Interest Expense Related to the Modification of Warrants | $				$ 7,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				350,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $				$ 123,250	1,376,250
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $		$ 0		$ 0
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]
Financing Receivable, Interest Rate, Stated Percentage		4.00%		4.00%
Expired [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		70,069		70,069
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		30,000,000		30,000,000
Share-based Payment Arrangement, Expense | $		$ 5,250	$ 1,269,700	$ 123,250	$ 1,369,350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				350,000	2,647,500
Subscription Agreement [Member]
Share Price | $ / shares		$ 0.75		$ 0.75
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.50		$ 0.50
Number of Warrants Per Unit		1		1
Warrant Component of Equity Unit, Number of Shares of Restricted Common Stock Called by Each Warrant		0.5		0.5
Sale of Units, Number Of Units Issued				1,584,733
Proceeds from the Sale of Units | $				$ 792,365
Proceeds from Sale of Units, Net of Commissions | $				$ 738,928
Stock Issued During Period, Shares, New Issues				1,584,733
Class of Warrant or Right, Issued During Period				792,369
Warrant Fair Value Price Per Share | $ / shares		$ 0.05		$ 0.05
Adjustments to Additional Paid in Capital, Warrant Issued | $		$ 28,176
Adjustments to Additional Paid in Capital, Other | $		$ 764,189
Subscription Agreement [Member] | Restricted Stock [Member]
Number of Shares Per Unit		1		1
Subscription Agreement Two [Member]
Share Price | $ / shares		$ 0.75		$ 0.75
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.50		$ 0.50
Number of Warrants Per Unit		1		1
Warrant Component of Equity Unit, Number of Shares of Restricted Common Stock Called by Each Warrant		0.5		0.5
Sale of Units, Number Of Units Issued		1,584,733
Proceeds from the Sale of Units | $		$ 792,365
Proceeds from Sale of Units, Net of Commissions | $		$ 738,928
Stock Issued During Period, Shares, New Issues		1,584,733
Class of Warrant or Right, Issued During Period		792,369
Warrant Fair Value Price Per Share | $ / shares		$ 0.05		$ 0.05
Adjustments to Additional Paid in Capital, Warrant Issued | $		$ 28,176
Adjustments to Additional Paid in Capital, Other | $		$ 764,189
Subscription Agreement Two [Member] | Restricted Stock [Member]
Number of Shares Per Unit		1		1
Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.60		$ 0.60
Class of Warrant or Right, Outstanding		16,600,000		16,600,000
Minimum [Member] | Expired [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.85		$ 0.85
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		2		2
Maximum [Member] | Expired [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 3		$ 3
Maximum [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Employees and Consultants [Member]
Stock Issued During Period, Value, Issued for Services | $		$ 45,256
Employees and Consultants [Member] | Minimum [Member]
Stock Issued During Period, Shares, Issued for Services				70,042
Share Price | $ / shares		$ 0.50		$ 0.50
Employees and Consultants [Member] | Maximum [Member]
Share Price | $ / shares		$ 0.74		$ 0.74
President [Member]
Number of Shares Per Unit		1		1
Number of Warrants Per Unit		1		1
Deferred Compensation, Converted to Units, Amount | $				$ 87,063
Accounts Payable, Converted to Units, Amount | $				$ 12,937
Deferred Compensation and Accounts Payable Converted to Units, Shares				200,000
Deferred Compensation, Loan Payable, and Accounts Payable Converted to Units, Price Per Unit | $ / shares		$ 0.50		$ 0.50
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right		0.5		0.5
Class of Warrant or Right, Number for Which Expiration Date Extended				3,104,010
Modification of Warrants | $				$ 68,758
President [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]
Interest Receivable | $		$ 796		796
President [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2023 [Member]
Financing Receivable, after Allowance for Credit Loss, Total | $		$ 30,000		$ 30,000
Financing Receivable, Interest Rate, Stated Percentage		4.00%		4.00%
Interest Receivable | $		$ 796		$ 796
President [Member] | Warrants Related to the Conversion of Deferred Compensation and Accounts Payable into Units [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.75		$ 0.75
President [Member] | Warrants Expiring on December 31, 2023 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.60		$ 0.60
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		300,000		300,000
Execution Bonus as Percentage of Exercised Options and Warrants		75.00%		75.00%
President [Member] | Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Plan Modification, Incremental Cost | $				$ 222,300
Chief Executive Officer [Member]
Class of Warrant or Right, Number for Which Expiration Date Extended				1,765,000
Modification of Warrants | $				$ 88,250
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]
Financing Receivable, after Allowance for Credit Loss, Total | $		$ 300,000		$ 300,000					$ 300,000
Financing Receivable, Interest Rate, Stated Percentage		4.00%		4.00%
Interest Receivable | $		$ 7,956		$ 7,956
Chief Executive Officer [Member] | Warrants Expiring on December 31, 2025 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.60		$ 0.60					$ 0.60
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		3,000,000		3,000,000					3,000,000
Consultant [Member]
Class of Warrant or Right, Issued During Period				125,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		125,000		125,000
Class of Warrant or Right, Issued During the Period, Value Issued for Expenses | $				$ 6,250
Consultant [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.74		$ 0.74
Consultant [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 1.20		$ 1.20
Centerpoint [Member]
Shares Held by Subsidiaries		704,309		704,309
Series B Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance	200	200		200		200
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01		$ 0.01		$ 0.01
Preferred Stock, Convertible Option Per Share | $ / shares	$ 2
Preferred Stock, Dividend Rate, Percentage	2.50%
Preferred Stock, Redemption Price Per Share | $ / shares	$ 100
Convertible Preferred Stock Redemption Period	3 years
Dividends, Preferred Stock, Total | $				$ 1,500		$ 2,000	$ 2,000
Dividends Payable | $		$ 15,500		$ 15,500