Note 15 - Share-based Compensation - Stock Option Activity (Details) - $ / shares	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Number of Shares Outstanding, Beginning Balance (in shares)	2,219,268
Weighted Average Exercise Price, Shares Outstanding, Beginning Balance (in dollars per share)	$ 1.94
Number of Shares Granted (in shares)	333,727		0
Weighted Average Exercise Price, Shares Granted (in dollars per share)	$ 3.40
Number of Shares Forfeited/expired (in shares)	(187,500)
Weighted Average Exercise Price, Shares Forfeited/expired (in dollars per share)	$ 1.99
Number of Shares Exercised (in shares)	(83,343)	(1,600)
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 1.73
Number of Shares Outstanding, Ending Balance (in shares)	2,282,152		2,219,268
Weighted Average Exercise Price, Shares Outstanding, Ending Balance (in dollars per share)	$ 2.17		$ 1.94
Number of Shares Exercisable (in shares)	1,539,220
Weighted Average Exercise Price, Shares Exercisable (in dollars per share)	$ 1.97