Option to buy back one of the two remaining properties for $147,500 and had a continuing option, though October 1, 2012, to purchase the one remaining property at an exercise price of $146,821 with a monthly option fee of $2,296. Subsequently, the New Option’s expiration date was extended twice, on October 1, 2012, which extended the expiration date through March 30, 2013, and again on April 1, 2013, which extended the expiration date through September 30, 2013. The New Option expired on September 30, 2013, and we continue to receive option fee payments on a month-to-month basis from the former option holder.
Write-down of investment in privately held company
The write-down related to an investment we made in a privately held Israeli-based company that offers surgeons and radiologists the ability to detect cancer in real time. Due to the fact that the privately held company is experiencing delays in executing its business plan, we determined to write down the value of our investment to $65,000 at December 31, 2013, resulting in a charge to the statement of operations of $35,000 during the year ended December 31, 2013.
Income before income tax expense
Income before provision for income tax for the year ended December 31, 2013 was $970,000 compared to $692,000 for the year ended December 31, 2012, an increase of $278,000 or 40.2%. This increase is primarily attributable to the increase in revenue, offset by the increase in interest expense.
Income tax expense
Income tax expense, including interest and penalties, for the years ended December 31, 2013 and 2012 was $387,000 and $303,000, respectively.
Net income
Net income for the year ended December 31, 2013 was $583,000 compared to net income of $389,000 for the prior year. This represents a 49.9% increase in net income year-to-year.
Liquidity and Capital Resources
At March 31, 2014, we had cash and cash equivalents of less than $1,000 and working capital of $5,767,000. At December 31, 2013, we had cash and cash equivalents of $1,021,000 and working capital of $4,677,000. The decrease in cash and cash equivalents primarily reflects an increase in our loan portfolio. The increase in working capital is primarily attributable to the decrease in long-term loans receivable.
For the three months ended March 31, 2014 net cash used in operating activities was $29,000, compared to $21,000 of net cash used in operating activities for the three months ended March 31, 2013. The increase in net cash used in operating activities primarily results from an increase in interest receivable on loans and a decrease in accounts payable and accrued expenses, offset by an increase in net income and a decrease in income taxes payable.
For the years ended December 31, 2013 and 2012, net cash provided by operating activities was $786,000 and $533,000, respectively. The increase in net cash provided by operating activities primarily results from an increase in net income and a write-down of investment in privately held company, offset by a decrease in accounts payable and accrued expenses.
For the three months ended March 31, 2014 net cash used in investing activities was $881,000, compared to $1,090,000 provided by investing activities for the three months ended March 31, 2013. Net cash used in investing activities for the three month period ended March 31, 2014, consisted of the issuance of our short term commercial loans in the amount of $4,774,000, offset by collection of commercial loans in the amount of $3,983,000. Net cash provided by investing activities for the three month period ended March 31, 2013, consisted of collection of commercial loans in the amount of $3,944,000, offset by the issuance of our short term commercial loans in the amount of $2,854,000.
For the year ended December 31, 2013 net cash used in investing activities was $1,071,000, compared to $4,210,000 for the year ended December 31, 2012. Net cash used in investing activities for the year ended December 31, 2013, consisted primarily of the issuance of our short term commercial loans in the amount of $15,159,000, offset by collection of these loans in the amount of $14,089,000. Net cash used in investing