Note 5. Stock-Based Compensation (Detail) - Options Outstanding and Exercisable (USD $)	6 Months Ended
	Jun. 30, 2012
Stock Options Outstanding (in Shares)	1,822,516
Weighted Average Exercise Price	$ 1.16
Weighted Average Remaining Contractual Life	7 years 32 days
$.55 To $1.00 Range [Member]
Range of Exercise Prices - Lower Limit	$ 0.55
Range of Exercise Prices - Upper Limit	$ 1.00
Stock Options Outstanding (in Shares)	252,000
Weighted Average Exercise Price	$ 0.72
Weighted Average Remaining Contractual Life	6 years 98 days
$1.01 To $1.50 [Member]
Range of Exercise Prices - Lower Limit	$ 1.01
Range of Exercise Prices - Upper Limit	$ 1.50
Stock Options Outstanding (in Shares)	1,338,500
Weighted Average Exercise Price	$ 1.17
Weighted Average Remaining Contractual Life	7 years 109 days
$1.51 To $1.74 [Member]
Range of Exercise Prices - Lower Limit	$ 1.51
Range of Exercise Prices - Upper Limit	$ 1.74
Stock Options Outstanding (in Shares)	232,016
Weighted Average Exercise Price	$ 1.64
Weighted Average Remaining Contractual Life	6 years 288 days