LEASES, Lease Assets, Liabilities and Lease Cost (Details)		3 Months Ended	12 Months Ended
		Dec. 31, 2020 USD ($) Lease	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 02, 2019 USD ($)
Leases [Abstract]
Operating lease assets		$ 11,772,000	$ 11,772,000	$ 13,897,000
Operating lease liabilities		$ 12,775,000	12,775,000
Number of finance leases executed | Lease		2
Assets [Abstract]
Operating lease assets		$ 11,772,000	11,772,000	13,897,000
Financing lease assets		44,000	44,000	0
Total assets		11,816,000	11,816,000	13,897,000
Current [Abstract]
Operating lease liabilities		3,530,000	3,530,000	3,823,000
Current maturities of financing lease obligations		14,000	14,000	0
Noncurrent [Abstract]
Operating lease liabilities, non-current		9,245,000	9,245,000	10,655,000
Financing lease liabilities, net of current obligation		29,000	29,000	0
Total lease liabilities		12,818,000	12,818,000	14,478,000
Lease Cost [Abstract]
Operating lease asset impairment expense			600,000
Finance [Abstract]
Total lease cost			5,347,000	5,050,000
Finance lease costs				0
Maximum [Member]
Assets [Abstract]
Financing lease assets		$ 100,000	100,000
Finance [Abstract]
Finance lease costs			1,000
ASU 2016-02 [Member]
Leases [Abstract]
Operating lease assets					$ 17,600,000
Operating lease liabilities					18,100,000
Pre-tax cumulative effect adjustment to retained earnings					500,000
Assets [Abstract]
Operating lease assets					$ 17,600,000
ASU 2016-02 [Member] | Maximum [Member]
Lease Cost [Abstract]
Operating lease asset impairment expense				100,000
Operating Expenses [Member]
Lease Cost [Abstract]
Operating lease cost			3,809,000	4,151,000
Variable lease cost	[1]		937,000	895,000
Finance [Abstract]
Amortization of lease assets	[2]		0	0
Impairment Expense [Member]
Lease Cost [Abstract]
Operating lease cost			601,000	4,000
Interest Expense [Member]
Finance [Abstract]
Interest on lease liabilities	[2]		$ 0	$ 0

[1] Variable lease cost includes payments for certain real estate taxes, insurance, common area maintenance, and other charges related to lease agreements, which are not included in the measurement of the operating lease liabilities.

[2] Finance lease costs are less than $1,000 for December 31, 2020; we had no finance lease costs in 2019.