Note 8 - Stockholders' Equity (Details Textual)		1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 05, 2019 USD ($) shares	Mar. 01, 2019 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2018 $ / shares shares
Common Stock, Shares Authorized			25,000,000		25,000,000
Common Stock, Par or Stated Value Per Share | $ / shares			$ 0.001		$ 0.001
Common Stock, Shares, Issued, Total			18,302,880		18,228,887
Preferred Stock, Shares Authorized			625,000
Proceeds from Issuance of Common Stock | $			$ 133,200
Share-based Payment Arrangement, Expense | $			$ 15,944	$ 78,273
Class of Warrant or Right, Outstanding, Non-vested Warrants				0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			25,000		70,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $			$ 0
Common Stock, Shares, Outstanding, Ending Balance			18,302,880		18,228,887
The 2011 Stock Options Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance			25,000
The 2015 Stock Option Plan [Member]
Stock Issued During Period, Shares, New Issues		45,000
Share Price | $ / shares		$ 2.96
Proceeds from Issuance of Common Stock | $		$ 133,200
Warrants [Member]
Share-based Payment Arrangement, Expense | $			$ 0	$ 0
Share-based Payment Arrangement, Option [Member] | The 2011 Stock Options Plan [Member]
Share-based Payment Arrangement, Expense | $			0	12,439
Director [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	45,660
Stock Issued During Period, Value, Restricted Stock Award, Gross | $	$ 157,500
Director [Member] | Restricted Stock [Member]
Share-based Payment Arrangement, Expense | $			$ 15,944	$ 65,834
Convertible Preferred Stock [Member]
Preferred Stock, Shares Outstanding, Ending Balance			0		0
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio			4