CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 35,000	$ 35,000
Common stock, par value	$ 0.0033	$ 0.0033
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	8,097,979	8,049,622
Common stock, shares outstanding	8,067,289	8,018,932
Treasury stock, shares	30,690	30,690