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Note 12 - Summary of Stock Options (Details Textual) - USD ($)		1 Months Ended					3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jul. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Jan. 31, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Nov. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)							9,755,454					9,755,454		10,087,678
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)							$ 1.96					$ 1.96		$ 2.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)												9 years 36 days		9 years 328 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)												1,018,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Consultant [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)		250		250
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					525
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in shares)			378		525
Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)			$ 38.08		$ 91
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate												0.00%
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total							$ 5,469,000					$ 5,469,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)												2 years 219 days
The 2006 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)							104					104
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)							0					0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)							$ 992					$ 992
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)												2 years 109 days
The 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)							9,755,350					9,755,350
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)							4,770,640					4,770,640
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)							$ 1.95					$ 1.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year)												9 years 36 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)	2,639,926
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)	14,512,457														11,872,531
The 2013 Plan [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)							550,000			0		1,018,000	23,069
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)							$ 0.36					$ 0.44	$ 117.86
The 2013 Plan [Member] \| Nonemployees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)							0			0		0	0
The 2013 Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)						3,625	0					0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares)												153
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)											0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)							2,217					2,217
2017 Employee Stock Purchase Plan [Member]
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)							220	300	320
Shares Issued, Price Per Share (in dollars per share)		$ 0.48					$ 0.44	$ 0.48	$ 0.59		$ 0.48	$ 0.44
Employee Stock Ownership Plan (ESOP), Number of Suspense Shares (in shares)							252					252
Employee Stock Ownership Plan (ESOP), Weighted Average Purchase Price of Shares Purchased (in dollars per share)							$ 0.17			$ 13.16		$ 0.29	$ 2.12
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate							0.00%			0.00%		0.00%	0.00%