Note 9 - Equity Distribution Agreement and Sale of Common Stock (Details Textual) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 31, 2020	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Apr. 24, 2020	Sep. 30, 2019
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.01	$ 0.01			$ 0.01
Proceeds from Issuance of Common Stock			$ 1,828,852
Sales Agreement With Northland [Member]
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.01
Equity Distribution Agreement, Maximum Amount					$ 13,850,000
Equity Distribution Agreement, Commission Rate		3.00%	3.00%
Stock Issued During Period, Shares, New Issues (in shares)		573,199
Proceeds from Issuance of Common Stock		$ 2,200,000
Proceeds from Issuance of Common Stock, Net		2,100,000
Sales Agreement With Northland [Member] | Other Current Assets [Member]
Common Stock, Share Subscribed but Unissued, Subscriptions Receivable		$ 300,000	$ 300,000
Sales Agreement With Northland [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)	80,043