LONG-TERM DEBT (Details) - USD ($)		3 Months Ended		6 Months Ended
	Oct. 12, 2015	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Jun. 30, 2015
Long-term debt
Consideration received in the sale, financing obligation				$ 6,800,000
Amortization of debt issuance costs		$ 645,000	$ 517,000	1,330,000	$ 920,000
Building Purchase Mortgage
Long-term debt
Credit agreement, outstanding balance		$ 0		$ 0
Fully repaid outstanding balance of the mortgage						$ 4,500,000
Deferred financing costs						$ 0
Building Purchase Mortgage
Long-term debt
Credit agreement, outstanding balance							$ 5,100,000
Interest rate (as a percent)							4.15%
Monthly principal and interest payments	$ 31,000
Final payment that would have been due June 12, 2019							$ 4,400,000
Deferred financing costs							$ 100,000
Amortization of debt issuance costs			$ 4,000		$ 9,000