Note 7 - Stockholders' Equity (Details Textual)		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 01, 2014 $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($)	Sep. 30, 2018 shares	Aug. 01, 2018 USD ($) $ / shares 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 | $				$ 13,904
Stock Issued During Period, Shares, CommissionsOnSaleOfUnits				1,028
Shares Issued for Warrant Exercise Commissions | $				$ 514
Proceeds from the Sale of Units | $				477,365	186,832
Adjustments to Additional Paid in Capital, Warrant Issued | $				$ 6,250
Class of Warrant or Right, Outstanding		16,300,000		16,300,000
Weighted Average Exercise Price for Outstanding Warrants | $ / shares				$ 0.96
Weighted Average Remaining Contractual Life for Outstanding Warrants				4 years 36 days
Class of Warrant or Right, Number for Which Expiration Date Extended				5,079,188
Modification of Warrants | $				$ 163,026
Interest Expense Related to the Modification of Warrants | $				$ 3,750
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				325,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $				$ 80,500
Expired [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		$ 1		$ 1
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		41,319		41,319
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		30,000,000		30,000,000
Allocated Share-based Compensation Expense, Total | $		$ 22,500	$ 97,350	$ 118,000	$ 99,650
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				325,000	295,000
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 Warrants Per Unit		1		1
Sale of Units, Number Of Units Issued				954,733
Proceeds from the Sale of Units | $				$ 477,365
Proceeds from Sale of Units, Net of Commissions | $				$ 432,929
Stock Issued During Period, Shares, New Issues				954,733
Class of Warrant or Right, Issued During Period				477,369
Warrant Fair Value Price Per Share | $ / shares		$ 0.05		$ 0.05
Adjustments to Additional Paid in Capital, Warrant Issued | $				$ 17,515
Adjustments to Additional Paid in Capital, Other | $				$ 459,850
Subscription Agreement [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
Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares		3		$ 3
Maximum [Member] | Employee Stock 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				25,718
Stock Issued During Period, Value, Issued for Services | $				$ 13,904
Employees and Consultants [Member] | Minimum [Member]
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, 2023 [Member]
Financing Receivable, Net, Total | $		$ 30,000		$ 30,000
Financing Receivable, Interest Rate, Stated Percentage		4.00%		4.00%
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] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation 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, Net, Total | $		$ 300,000		$ 300,000					$ 300,000
Financing Receivable, Interest Rate, Stated Percentage		4.00%		4.00%
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
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 | $		$ 15,000		$ 15,000