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Note 10 - Common Stock and Stock-based Compensation (Details Textual)		3 Months Ended		6 Months Ended
	Apr. 30, 2019	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) shares	Jun. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) shares
Stock Issued During Period, Shares, Issued for Services		4,127	0	4,127	10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance		29,441		29,441
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance | $ / shares		$ 53.19		$ 53.19
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number		13,585		13,585
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price | $ / shares		$ 93.92		$ 93.92
Share-based Payment Arrangement, Expense | $		$ 26,664	$ 23,221	$ 53,316	$ 47,199
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $		157,067		$ 157,067
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 328 days
Stock Issued During Period, Value Expensed During the Period, Issued for Services | $		$ 78,509	$ 57,143	$ 205,080	$ 85,714
Common Stock Purchase Warrants [Member]
Class Of Warrant Or Right Issued During Period				100,002
Class of Warrant or Right, Outstanding		294,302		294,302
Class Of Warrant Or Right Outstanding Weighted Average Exercise Price | $ / shares		$ 7.50		$ 7.50
Class Of Warrant Or Right Exercisable Number		194,300		194,300
Class Of Warrant Or Right Exercisable Weighted Average Exercise Price | $ / shares		$ 7.50		$ 7.50
Conversion from Series C and F Convertible Preferred Stock to Common Stock [Member]
Conversion of Stock, Shares Issued		253,300		371,580
Conversion of Series D Preferred Stock Into Common Stock [Member]
Conversion of Stock, Shares Issued			46,000		106,000
Reverse Stock Split [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	500

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