SHAREHOLDERS' EQUITY (Narrative) (Details) - USD ($)		3 Months Ended		9 Months Ended		12 Months Ended
	May 22, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Jun. 01, 2020
Stockholders' Equity Note [Abstract]
Net income (loss)		$ (778,000)	$ 430,000	$ (6,364,000)	$ 2,286,000	$ 4,067,000
Dividends paid		(151,000)	(126,000)	(455,000)	(379,000)	(531,000)
Other comprehensive income, net of tax		(447,000)	$ 782,000	429,000	4,313,000	4,013,000
Common stock issued				25,000	$ 53,000	53,000
Treasury stock acquired		$ 13,000		$ 34,000		$ 7,000
Shares of common stock repurchased and placed in treasury (in shares)				2,364		436
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]
Shares issued under incentive plan (in shares)	1,763