As of September 30, 2019 and March 31, 2019, trading and available-for-sale  securities consisted of:

The Company recognized no other than temporary impairment in accumulated other comprehensive income.

The fair value of assets and liabilities is determined using observable market data based on recent trading activity. Where observable market data is unavailable due to a lack of trading activity, the Company utilizes internally developed models to estimate fair value and independent third parties to validate assumptions, when appropriate. Estimating fair value requires significant management judgment, including benchmarking to similar instruments with observable market data and applying appropriate discounts that reflect differences between the securities that the Company is valuing and the selected benchmark. Depending on the type of securities owned by the Company, other valuation methodologies may be required.

Measurement of fair value is classified within a hierarchy based upon the transparency of inputs used in the valuation of an asset or liability. Classification within the hierarchy is based upon the lowest level of input that is significant to the fair value measurement.

The valuation hierarchy contains three levels:

The following tables present trading and available-for-sale  securities assets in the condensed consolidated financial statements at fair value on a recurring basis as of September 30, 2019 and March 31, 2019:

The table below presents the Valuation Techniques and Significant Level 3 Inputs used in the valuation as of March 31, 2019. The table is not intended to be all inclusive, but instead captures the significant unobservable inputs relevant to determination of fair value.

The following table provides a reconciliation of the beginning and ending balances for investments that use Level 3 inputs for the six months ended September 30, 2019:

Of the available-for-sale securities, $8,534 is held as a reserve for distribution to shareholders who have not yet claimed their distributions from the 2011 sale of the Company’s oil and gas exploration and production operations. These funds are currently payable, subject to the entitled shareholders completing and submitting to the Company the necessary documentation to claim his, her or its distribution payments. The Company has no control over when, or if, any entitled shareholder will submit the necessary documentation to claim his, her, or its distribution payment.