SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	May 21, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 01, 2020
Stockholders' Equity Note [Abstract]
Net loss		$ (644,000)	$ (778,000)	$ (961,000)	$ (6,364,000)	$ (8,619,000)
Dividends paid		(152,000)	(151,000)	(456,000)	(455,000)	(607,000)
Other comprehensive income, net of tax		$ (415,000)	(447,000)	(957,000)	429,000	1,142,000
Common stock issued				$ 26,000	25,000	25,000
Treasury stock acquired			$ 13,000		$ 34,000	$ 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
Directors
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Stock issued for compensation (in shares)	2,262