Consolidated Balance Sheets (Parenthetical) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Consolidated Balance Sheets
Accounts receivable, allowance for doubtful accounts	$ 677,000	$ 515,000
Shareholders' Equity
Voting Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Voting Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Nonvoting Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Nonvoting Preferred Stock, shares authorized (in shares)	1,000,000	1,000,000
Common Stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, shares authorized (in shares)	50,000,000	50,000,000
Common Stock, shares issued (in shares)	9,056,421	9,029,852
Common Stock, shares outstanding (in shares)	6,221,976	6,265,527
Treasury Stock, shares (in shares)	2,834,445	2,765,325