SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Jun. 01, 2020
Stockholders' Equity Note [Abstract]
Net income (loss)	$ 722,000	$ (860,000)	$ (8,619,000)
Dividends paid	(152,000)	(152,000)	(607,000)
Other comprehensive income, net of tax	$ (1,146,000)	(2,485,000)	1,142,000
Common stock issued			25,000
Treasury stock acquired		$ 6,000	$ 36,000
Shares of common stock repurchased and placed in treasury (in shares)	0		2,509
Maximum
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Stock repurchase program, authorized amount				$ 500,000