Condensed Consolidated Balance Sheets (Unaudited) - Parenthetical - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Details
Accounts Receivable, Allowance for Credit Loss, Current	$ 155,000	$ 140,000
Preferred Stock, Par or Stated Value Per Share	$ 0	$ 0
Preferred Stock, Shares Authorized	500,000	500,000
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 1.00	$ 1.00
Common Stock, Shares Authorized	4,000,000	4,000,000
Common Stock, Shares, Issued	1,138,096	1,138,096
Common Stock, Shares, Outstanding	966,132	966,132
Treasury Stock, Shares	171,964	171,964