CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Allowance for doubtful accounts	$ 410,000	$ 390,000
SHAREHOLDERS' EQUITY:
Preferred Stock, par value (in dollars per share)	$ 0	$ 0
Preferred Stock, authorized (in shares)	10,000,000	10,000,000
Preferred Stock, outstanding (in shares)	0	0
Common Stock, par value (in dollars per share)	$ 0	$ 0
Common Stock, authorized (in shares)	20,000,000	20,000,000
Common Stock, issued (in shares)	1,860,261	1,861,106
Common Stock, outstanding (in shares)	1,860,261	1,861,106