Note 5. Stock-Based Compensation (Detail) - Exercisable Options by Exercise Price (USD $)	9 Months Ended
	Sep. 30, 2012
Stock Options Exercisable (in Shares)	876,000
Exercisable - Weighted Average Exercise Price	$ 1.20
$.55 To $1.00 Range [Member] | Exercisable [Member]
Range of Exercise Prices - Lower Limit	$ 0.55
Range of Exercise Prices - Upper Limit	$ 1.00
$.55 To $1.00 Range [Member]
Range of Exercise Prices - Lower Limit	$ 0.55
Range of Exercise Prices - Upper Limit	$ 1.00
Stock Options Exercisable (in Shares)	212,000
Exercisable - Weighted Average Exercise Price	$ 0.75
$1.01 To $1.50 [Member] | Exercisable [Member]
Range of Exercise Prices - Lower Limit	$ 1.01
Range of Exercise Prices - Upper Limit	$ 1.50
$1.01 To $1.50 [Member]
Range of Exercise Prices - Lower Limit	$ 1.01
Range of Exercise Prices - Upper Limit	$ 1.50
Stock Options Exercisable (in Shares)	489,000
Exercisable - Weighted Average Exercise Price	$ 1.23
$1.51 To $1.74 [Member] | Exercisable [Member]
Range of Exercise Prices - Lower Limit	$ 1.51
Range of Exercise Prices - Upper Limit	$ 1.74
$1.51 To $1.74 [Member]
Range of Exercise Prices - Lower Limit	$ 1.51
Range of Exercise Prices - Upper Limit	$ 1.74
Stock Options Exercisable (in Shares)	175,000
Exercisable - Weighted Average Exercise Price	$ 1.68