Note 14 - Share-based Compensation - Stock Options Outstanding (Details)	9 Months Ended
	Jun. 30, 2019 $ / shares shares
Upper Exercise Price (in dollars per share)	$ 1.69
Number Outstanding (in shares) | shares	2,591,242
Number Exercisable (in shares) | shares	1,736,114
Range One [Member]
Number Outstanding (in shares) | shares	572,266
Weighted Average Remaining Contractual Life (Year)	2 years 332 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.57
Number Exercisable (in shares) | shares	557,639
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.57
Weighted Average Exercise Price, Exercisable (in dollars per share)	1.57
Range Two [Member]
Upper Exercise Price (in dollars per share)	$ 1.86
Number Outstanding (in shares) | shares	523,726
Weighted Average Remaining Contractual Life (Year)	2 years 211 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.80
Number Exercisable (in shares) | shares	466,663
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.81
Lower Exercise Price (in dollars per share)	1.71
Weighted Average Exercise Price, Exercisable (in dollars per share)	1.81
Range Three [Member]
Upper Exercise Price (in dollars per share)	$ 1.99
Number Outstanding (in shares) | shares	1,125,000
Weighted Average Remaining Contractual Life (Year)	4 years 32 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.99
Number Exercisable (in shares) | shares	343,750
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.99
Lower Exercise Price (in dollars per share)	1.99
Weighted Average Exercise Price, Exercisable (in dollars per share)	1.99
Range Four [Member]
Upper Exercise Price (in dollars per share)	$ 3.13
Number Outstanding (in shares) | shares	360,250
Weighted Average Remaining Contractual Life (Year)	1 year 357 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.55
Number Exercisable (in shares) | shares	358,062
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.55
Lower Exercise Price (in dollars per share)	2.02
Weighted Average Exercise Price, Exercisable (in dollars per share)	2.55
Range Five [Member]
Upper Exercise Price (in dollars per share)	$ 3.17
Number Outstanding (in shares) | shares	10,000
Weighted Average Remaining Contractual Life (Year)	2 years 142 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 3.17
Number Exercisable (in shares) | shares	10,000
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.17
Lower Exercise Price (in dollars per share)	3.17
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 3.17