Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Trade accounts receivable, allowance for doubtful accounts (in Dollars)	$ 298,235	$ 315,417
Property, plant and equipment, accumulated depreciation (in Dollars)	$ 8,283,620	$ 7,811,276
Capital stock, authorized shares	3,000,000	3,000,000
Capital stock, shares issued	0	0
Capital stock, shares outstanding	0	0
Common stock, par value (in Dollars per share)	$ 0.10	$ 0.10
Common stock, authorized	22,000,000	22,000,000
Common stock, shares issued	5,662,326	5,630,197
Common stock, shares outstanding	5,662,326	5,630,197