Note 8 - Stockholders' Equity (Details Textual)		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2014 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)
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 | $				$ 16,350	$ 13,904
Proceeds from the Sale of Units | $				977,000	477,365
Payments of Stock Issuance Costs | $				$ 87,200	44,436
Adjustments to Additional Paid in Capital, Warrant Issued | $					6,250
Class of Warrant or Right, Outstanding		740,551		740,551
Weighted Average Exercise Price for Outstanding Warrants | $ / shares				$ 0.84
Weighted Average Remaining Contractual Life for Outstanding Warrants				2 years 292 days
Modification of Warrants | $				$ 35,339
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				390,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $				$ 99,500	80,500
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $		$ 0		$ 0
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 | $		$ 99,500	$ 22,500	$ 99,500	$ 118,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				390,000	325,000
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 Shares Per Unit		1		1
Number of Warrants Per Unit		1		1
Sale of Units, Number Of Units Issued				18,000
Proceeds from the Sale of Units | $				$ 9,000
Proceeds from Sale of Units, Net of Commissions | $				8,100
Payments of Stock Issuance Costs | $				$ 900
Stock Issued During Period, Shares, New Issues				18,000
Class of Warrant or Right, Issued During Period				9,000
Warrant Fair Value Price Per Share | $ / shares		$ 0.05		$ 0.05
Adjustments to Additional Paid in Capital, Warrant Issued | $				$ 333
Adjustments to Additional Paid in Capital, Other | $				$ 8,667
Warrant Component of Equity Unit, Number of Shares of Restricted Common Stock Called by Each Warrant		0.5		0.5
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
Sale of Units, Number Of Units Issued				1,936,001
Proceeds from the Sale of Units | $				$ 968,000
Proceeds from Sale of Units, Net of Commissions | $				881,700
Payments of Stock Issuance Costs | $				$ 86,300
Stock Issued During Period, Shares, New Issues				1,936,001
Class of Warrant or Right, Issued During Period				1,936,001
Warrant Fair Value Price Per Share | $ / shares		$ 0.05		$ 0.05
Adjustments to Additional Paid in Capital, Warrant Issued | $				$ 47,098
Adjustments to Additional Paid in Capital, Other | $				$ 920,902
Warrant Component of Equity Unit, Number of Shares of Restricted Common Stock Called by Each Warrant		1		1
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		18,800,000		18,800,000
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 2		$ 2
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, Shares, Issued for Services				29,000
Stock Issued During Period, Value, Issued for Services | $				$ 16,350
Employees and Consultants [Member] | Minimum [Member]
Share Price | $ / shares		0.48		$ 0.48
Employees and Consultants [Member] | Maximum [Member]
Share Price | $ / shares		0.75		0.75
President [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 0.75		$ 0.75
Number of Shares Per Unit		1		1
Number of Warrants Per Unit		1		1
Deferred Compensation, Converted to Units, Amount | $				$ 3,828	$ 3,828
Accounts Payable, Converted to Units, Amount | $				$ 52,830	$ 15,000
Deferred Compensation and Accounts Payable Converted to Units, Shares				143,316
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		1		1
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
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 | $				$ 1,000		$ 2,000	$ 2,000
Dividends Payable | $		$ 17,000		$ 17,000