Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2020
Summary of Significant Accounting Policies [Abstract]
Basis of Presentation and Use of Estimates	Basis of Presentation and Use of Estimates The unaudited consolidated financial statements and accompanying notes are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information. Pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. Because certain information and footnote disclosures have been condensed or omitted, these unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes in the Company’s Annual Report on Form 10-K for the fiscal year ended March 31, 2020, as filed on May 28, 2020 with the SEC. In the Company’s opinion all normal and recurring adjustments considered necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented have been included. The Company believes that the disclosures made in the unaudited consolidated interim financial statements are adequate to make the information not misleading. The results of operations for the interim periods presented are not necessarily indicative of the results for the year. The Company is also required to make certain estimates with regard to the valuation of awards and forfeiture rates for its share-based award programs. New estimates in the period relate to determining the Company’s estimated incremental borrowing rate in recognizing right of use assets and operating lease liabilities. Estimates and assumptions are reviewed periodically, and the effects of revisions are reflected in the financial statements in the applicable period. Accordingly, actual results could materially differ from those estimates. The accompanying consolidated financial statements include the accounts of the Company and its subsidiaries, including PDV Spectrum Holding Company, LLC formed in April 2014. All significant intercompany accounts and transactions have been eliminated in consolidation.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform to the presentation of the corresponding amounts in the financial statements for the three and nine months ended December 31, 2020. These reclassifications had no effect on previously reported net loss or net loss per common share basic and diluted.
Intangible Assets	Intangible Assets Intangible assets are wireless licenses that will be used to provide the Company with the exclusive right to utilize designated radio frequency spectrum to provide wireless communication services. On May 13, 2020, the FCC approved the Report and Order to modernize and realign the 900 MHz band to increase its usability and capacity by allowing it to be utilized for the deployment of broadband networks, technologies and solutions. The Report and Order was published in the Federal Register on July 16, 2020 and became effective on August 17, 2020. The Company is now engaged in qualifying for and securing broadband licenses from the FCC, with a focus on pursuing licenses in those counties in which it believes it has near-term commercial opportunities. While licenses are issued for only a fixed time, generally ten years, such licenses are subject to renewal by the FCC. License renewals have occurred routinely and at nominal cost in the past. There are currently no legal, regulatory, contractual, competitive, economic or other factors that limit the useful life of the Company’s wireless licenses. As a result, the Company has determined that the wireless licenses should be treated as an indefinite-lived intangible asset. The Company will evaluate the useful life determination for its wireless licenses each year to determine whether events and circumstances continue to support their treatment as an indefinite useful life asset. The licenses are tested for impairment annually on an aggregate basis, as the Company will be utilizing the wireless licenses on an integrated basis as part of developing broadband. In the year ended March 31, 2020, (“Fiscal 2020”), the Company performed a step zero qualitative approach to test indefinite-lived intangible assets for impairment by first assessing qualitative factors to determine whether it is more-likely-than-not that the fair value of an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform quantitative impairment testing. There are no triggering events indicating impairment in the three and nine months ended December 31, 2020. See Note 4 “Intangible Assets” for a discussion of the Company’s (gain)/loss from the disposal of intangible assets incurred during the period ended December 31, 2020.
Long-Lived Asset and Right of Use Asset Impairment	Long-Lived Asset and Right of Use Asset Impairment The Company evaluates long-lived assets, including right of use assets, other than intangible assets with indefinite lives, for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. Asset groups are determined at the lowest level for which identifiable cash flows are largely independent of cash flows of other groups of assets and liabilities. When the carrying amount of the asset groups are not recoverable and exceeds its fair value, an impairment loss is recognized equal to the excess of the asset group’s carrying value over the estimated fair value. During the three and nine months ended December 31, 2020, the Company recorded a $11,000 and $40,000, respectively, a non-cash impairment charge for long-lived assets consisting of network site costs to reduce the carrying values to zero. During the nine months ended December 31, 2019, the Company recorded a $33,000 non-cash impairment charge for long-lived assets consisting of $22,000 for property and equipment and $11,000 for a right of use asset to reduce the carrying values to zero.
Net Loss Per Share of Common Stock	Net Loss Per Share of Common Stock Basic net loss per common share is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period, without consideration for potentially dilutive securities. For purposes of the diluted net loss per share calculation, preferred stock, stock options, restricted stock and warrants are considered to be potentially dilutive securities. Because the Company has reported a net loss for the three and nine months ended December 31, 2020 and 2019, respectively, diluted net loss per common share is the same as basic net loss per common share for those periods. Common stock equivalents resulting from potentially dilutive securities approximated 1,402,000 and 1,396,000 at December 31, 2020 and 2019, respectively, and have not been included in the dilutive weighted average shares of common stock outstanding, as their effects are anti-dilutive.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASC 326, Financial Instruments - Credit Losses and has subsequently modified several areas of the standard in order to provide additional clarity and improvements. The new standard requires entities to use a Current Expected Credit Loss impairment model based on expected losses rather than incurred losses. Under this model, an entity would recognize an impairment allowance equal to its current estimate of all contractual cash flows that the entity does not expect to collect from financial assets measured at amortized cost within the scope of the standard. The entity's estimate would consider relevant information about past events, current conditions and reasonable and supportable forecasts, which will result in recognition of lifetime expected credit losses. As a smaller reporting company, the standard will be effective for the Company's fiscal year beginning April 2023, including interim reporting periods within that fiscal year, although early adoption is permitted. The Company is evaluating the potential impact that ASC 326 and subsequent modifications may have on its consolidated financial statements. Other accounting standards that have been issued or proposed by the FASB or other standard-setting bodies that do not require adoption until a future date are not expected to have a material impact on the Company’s consolidated financial statements upon adoption.