Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Note 9 – Share-Based Compensation Stock Option Plans As of June 30, 2015 , we have reserved 559,914 shares of common stock for options and other share-based incentive awards that are still available for grant under our 2006 and 2015 stock incentive plans, and 674,260 shares for options that have been granted under either the 2006 stock incentive plan or the 1998 stock option plan but have not yet been exercised. We issue new shares of common stock upon exercise of stock options. Amounts recognized in the condensed consolidated financial statements related to share-based compensation are as follows (expressed in thousands): Three Months Ended June 30, Six Months Ended June 30, 2015 2014 2015 2014 Total cost of share-based compensation $ 161 $ 142 $ 322 $ 284 Amount of income tax benefit recognized in earnings (21 ) (22 ) (42 ) (43 ) Amount charged against net income $ 140 $ 120 $ 280 $ 241 The fair value of each option grant is estimated on the date of grant using the Black-Scholes option-pricing model (Black-Scholes). We use historical data to estimate the expected price volatility, expected option life and expected forfeiture rate. Our estimates are based on expected volatility for awards granted on daily historical trading data of our common stock for a period equivalent to the expected term of the award. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant for the estimated life of the option. We estimate the expected term consistent with historical exercise and cancellation activity of its previous share-based grants with a seven year contractual term. Forfeitures are based on historical experience. The dividend yield is calculated based upon the dividend payments made during the prior four quarters as a percent of the average stock price for that period. A summary of the option activity for the first six months of 2015 is as follows (expressed in thousands, except share and per share amounts) : Weighted Weighted Average Aggregate Average Remaining Intrinsic Exercise Contractual Value Shares Price Term (in thousands) Options outstanding, December 31, 2014 722,675 $ 14.35 4.58 $ 2,555 Granted - - - - Exercised (42,815 ) 12.69 - - Cancelled or expired (5,600 ) 16.15 - - Options outstanding, June 30, 2015 674,260 $ 14.44 4.14 $ 1,230 Options exercisable, June 30, 2015 483,985 $ 13.60 3.47 $ 1,189 The total intrinsic value of options exercised was $42,000 and $108,000 during the three-months ended June 30, 2015 and 2014 , respectively, and $183,000 and $336,000 during the six-months ended June 30, 2015 and 2014 , respectively. A summary of the status of our unvested option shares as of June 30, 2015 is as follows: Weighted Average Grant Date Shares Fair Value Unvested at December 31, 2014 227,400 $ 4.35 Options granted - - Options cancelled (4,625 ) $ 4.14 Options vested (32,506 ) $ 5.41 Unvested at June 30, 2015 190,269 $ 4.13 As of June 30, 2015 , there was $640,000 of total unrecognized compensation cost related to unvested share-based compensation granted under our plans. That cost is expected to be recognized over a weighted-average period of 1.1 years. The total fair value of option shares vested during the three-months ended June 30, 2015 and 2014 was $88,000 and $77,000, respectively, and $176,000 and $154,000 during the six-months ended June 30, 2015 and 2014 , respectively. Employee Stock Purchase Plan On May 27, 2015, our shareholders approved the 2015 Employee Stock Purchase Plan (“Purchase Plan”) whereby 50,000 shares of common stock will be available for future sale. The first offering period will begin January 1, 2016 and provides participants an option to purchase shares of our common stock at a price per share equal to 85 percent of the value of the share of common stock at the beginning or end of the offering period (whichever is less). |