Note 14 - Share-based Compensation - Stock Options Outstanding (Details)	12 Months Ended
	Sep. 30, 2019 $ / shares shares
Number Outstanding (in shares) | shares	2,219,268
Weighted Average Remaining Contractual Life (Year)	3 years 142 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.95
Number Exercisable (in shares) | shares	1,405,578
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.94
Range One [Member]
Lower Exercise Price (in dollars per share)
Upper Exercise Price (in dollars per share)	$ 1.76
Number Outstanding (in shares) | shares	637,876
Weighted Average Remaining Contractual Life (Year)	3 years 91 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.65
Number Exercisable (in shares) | shares	576,155
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.64
Range Two [Member]
Lower Exercise Price (in dollars per share)
Upper Exercise Price (in dollars per share)	$ 1.86
Number Outstanding (in shares) | shares	160,142
Weighted Average Remaining Contractual Life (Year)	3 years 76 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.86
Number Exercisable (in shares) | shares	160,142
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.86
Range Three [Member]
Lower Exercise Price (in dollars per share)	1.99
Upper Exercise Price (in dollars per share)	$ 1.99
Number Outstanding (in shares) | shares	1,125,000
Weighted Average Remaining Contractual Life (Year)	3 years 306 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 1.99
Number Exercisable (in shares) | shares	375,000
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 1.99
Range Four [Member]
Lower Exercise Price (in dollars per share)	2.02
Upper Exercise Price (in dollars per share)	$ 1.99
Number Outstanding (in shares) | shares	296,250
Weighted Average Remaining Contractual Life (Year)	2 years 25 days
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 2.49
Number Exercisable (in shares) | shares	294,281
Weighted Average Exercise Price, Exercisable (in dollars per share)	$ 2.50