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Note 6 - Stockholders' Equity (Deficiency) (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	May 14, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2015	Dec. 31, 2016
Common Stock, Dividends, Per Share, Declared		$ 0
Common Stock, No Par Value		$ 0		$ 0
Stock Issued During Period, Shares, Warrants Exercised		15,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.48		$ 0.48
Proceeds from Warrant Exercises		$ 6,600	$ 0
Stock Issued During Period, Value, New Issues		$ 2,551,500
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				725,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		1,530,000		1,605,000		1,010,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value		$ 154,208		$ 0
2015 Stock Options Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum					10.00%
Common Stock, Capital Shares Reserved for Future Issuance, Percentage					10.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period		75,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		1,530,000		1,605,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Fully Vested, Outstanding, Number		1,205,000		1,230,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expected to Vest, Outstanding, Number		325,000		375,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		1,237,500		1,267,500
2015 Stock Options Plan [Member] \| Vesting at the Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		10.00%
2015 Stock Options Plan [Member] \| Vesting One Year Following the Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		15.00%
2015 Stock Options Plan [Member] \| Vesting Per Month Starting 13 Months After the Grant Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		2.00%
2015 Stock Options Plan [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	25,000
2015 Stock Options Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period					10 years
Private Placement [Member]
Stock Issued During Period, Value, New Issues		$ 2,551,500
Stock Issued During Period, Shares, New Issues		7,290,000
Shares Issued, Price Per Share		$ 0.35
Private Placement [Member] \| Commission Fees [Member]
Payments of Stock Issuance Costs		$ 253,750
Private Placement [Member] \| Other Stock Issuance Fees [Member]
Payments of Stock Issuance Costs		$ 17,608
Warrants Exercised Subsequent to the Year Ended December 31, 2017 [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 0.44
Proceeds from Warrant Exercises		$ 6,600