STOCK-BASED COMPENSATION - Stock based compensation, restricted share activity (Details) - Restricted common shares	12 Months Ended
	Sep. 30, 2021 $ / shares shares
Restricted shares, share-based compensation arrangement rollforward
Beginning balance (in shares) | shares	128,000
Granted (in shares) | shares	150,150
Vested (in shares) | shares	(20,000)
Forfeited (in shares) | shares	(21,000)
Ending balance (in shares) | shares	237,000
Restricted shares, weighted-average exercise price share-based compensation arrangement rollforward
Beginning balance (in dollars per share) | $ / shares	$ 3.88
Granted (in dollars per share) | $ / shares	10.50
Vested (in dollars per share) | $ / shares	1.99
Forfeited (in dollars per share) | $ / shares	6.80
Ending balance (in dollars per share) | $ / shares	$ 7.96