Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Accounts receivable-trade, allowance for doubtful accounts	$ 10,637	$ 2,404
Other intangibles, accumulated amortization	$ 710,176	$ 708,845
Preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0024	$ 0.0024
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares issued (in shares)	11,313,692	11,235,992
Common stock, shares outstanding (in shares)	9,270,862	9,193,162
Treasury stock, shares (in shares)	2,042,830	2,042,830