Note 9 - Net Income (Loss) Per Share Attributable to Common Shareholders (Details Textual) - shares	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	593,201	690,201
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	5,403,954	5,403,954
Convertible Preferred Stock Convertible to Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)		934,109