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Note 12. Stock Warrants: Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Other, Description (Policies)
6 Months Ended
Jun. 30, 2016
Policies  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Other, Description

The Company records compensation expense for stock warrants based on the estimated fair value of the warrants on the date of grant using the Black-Scholes valuation model.  The Company uses historical data among other factors to estimate the expected price volatility, the expected warrant term and the expected forfeiture rate.  The risk-free rate is based on the U.S. Treasury yield curve in effect at the date of grant for the expected term of the warrant.