Note 4 - Valuation and Qualifying Accounts (Detail) - Summary of roll forward of allowance for doubtful accounts: (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Balance at beginning of year	$ 80,926	$ 146,929	$ 136,023
Additions (reductions) charged to costs and expenses	77,143	(45,315)	25,348
Foreign exchange gain/loss	242	156	595
Write-offs	(46,315)	(20,844)	(15,037)
Balance at end of year	$ 111,996	$ 80,926	$ 146,929