Consolidated Balance Sheets (Parentheticals) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	[1]
CURRENT ASSETS:
Allowance for doubtful accounts	$ 6,132	$ 15,703
Accumulated amortization	$ 692,202	$ 690,869
STOCKHOLDERS' EQUITY:
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)	10,354,563	10,353,155
Treasury stock, shares (in shares)	1,422,339	1,292,594
Accumulated other comprehensive loss, tax	$ 485,250	$ 480,112

[1] As described in Note 2 to these Consolidated Financial Statements, we have restated the Consolidated Financial Statements.