Interim Financial Reporting (Policies)	3 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]
Use of Estimates	Use of estimates: Management uses estimates and assumptions in preparing the condensed financial statements in accordance with U.S. GAAP. Those estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Actual results could vary from the estimates that were used. The Company believes the critical accounting policies that require the most significant assumptions and judgments in the preparation of its condensed financial statements include revenue recognition and the related estimation of selling price adjustments, allowance for doubtful accounts, inventory obsolescence, share-based compensation, income taxes and the warranty reserve.
Net income per common share	Net income per common share: Net income is presented on a per share basis for both basic and diluted common shares. Basic net income per common share is computed using the weighted average number of common shares outstanding during the period, excluding any restricted stock awards which have not vested. The diluted net income per common share calculation includes outstanding restricted stock grants and assumes that all stock options were exercised and converted into common stock at the beginning of the period, unless their effect would be anti-dilutive. Common stock equivalents excluded from the calculation of diluted earnings per share because their impact was anti-dilutive was 177,750 and 196,500 for the three months ended September 30, 2017 and 2016, respectively.
New Accounting Pronouncements	New accounting pronouncements: In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance creating Accounting Standards Codification (“ASC”) Section 606, “Revenue from Contracts with Customers.” The new section will replace ASC Section 605, “Revenue Recognition,” and creates modifications to various other revenue accounting standards for specialized transactions and industries. The section is intended to conform revenue accounting principles with a concurrently issued International Financial Reporting Standards with previously differing treatment between U.S. practice and that of much of the rest of the world, as well as to enhance disclosures related to disaggregated revenue information. Entities will have the option to apply the standard retrospectively to all prior periods presented (“full retrospective”), or to apply it retrospectively only to contracts existing at the effective date (“modified retrospective”), with the cumulative effect of the standard recorded as an adjustment to beginning retained earnings. The updated guidance will be effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within that year. The Company is currently evaluating which of the alternative approaches it will apply and the potential impact of adoption of the revised revenue standards on its financial statements. The Company intends to complete its evaluation during its fiscal year ending June 30, 2018. In July 2015, FASB issued ASU 2015-11, “Inventory (Topic 330) Related to Simplifying the Measurement of Inventory,” which applies to all inventory except that which is measured using last-in, first-out (“LIFO”) or the retail inventory method. Inventory measured using first-in, first-out (“FIFO”) or average cost is within the scope of the new guidance and should be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation. Subsequent measurement is unchanged for inventory measured using LIFO or the retail inventory method. The amendments are effective for public business entities for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The new guidance is applied prospectively, and earlier application is permitted as of the beginning of an interim or annual reporting period. The Company adopted ASU 2015-11 effective July 1, 2017, which had no material impact on its financial statements or financial statement disclosures. In February 2016, FASB issued ASU 2016-02, “Leases (Topic 842).” This standard requires the recognition of all lease transactions with terms in excess of 12 months on the balance sheet as a lease liability and a right-of-use asset (as defined in the standard). ASU 2016-02 will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with earlier application permitted. Upon adoption, the lessee will apply the new standard retrospectively to all periods presented or retrospectively using a cumulative effect adjustment in the year of adoption. The Company has evaluated that ASU 2016-02 will have no material impact on its financial statements or financial statement disclosures upon adoption based on current facts and circumstances. In March 2016, FASB issued ASU 2016-09, “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting,” which reduces complexity in accounting standards related to share-based payment transactions, including, among others, (1) accounting for income taxes, (2) classification of excess tax benefits on the statement of cash flow, (3) forfeitures, and (4) statutory tax withholding requirements. ASU 2016-09 is effective for annual reporting periods beginning on or after December 15, 2016, and interim periods within those annual periods. The Company adopted ASU 2016-09 effective July 1, 2017, which had no material impact on its previously reported financial statements in the Company’s Annual Report on Form 10-K for fiscal 2017. The Company has elected to continue to recognize estimated forfeitures as stock-based compensation expense.

Interim Financial Reporting (Policies)

3 Months Ended

Sep. 30, 2017

Use of estimates: Management uses estimates and assumptions in preparing the condensed financial statements in accordance with U.S. GAAP. Those estimates and assumptions affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Actual results could vary from the estimates that were used. The Company believes the critical accounting policies that require the most significant assumptions and judgments in the preparation of its condensed financial statements include revenue recognition and the related estimation of selling price adjustments, allowance for doubtful accounts, inventory obsolescence, share-based compensation, income taxes and the warranty reserve.

Net income per common share

Net income per common share: Net income is presented on a per share basis for both basic and diluted common shares. Basic net income per common share is computed using the weighted average number of common shares outstanding during the period, excluding any restricted stock awards which have not vested. The diluted net income per common share calculation includes outstanding restricted stock grants and assumes that all stock options were exercised and converted into common stock at the beginning of the period, unless their effect would be anti-dilutive. Common stock equivalents excluded from the calculation of diluted earnings per share because their impact was anti-dilutive was 177,750 and 196,500 for the three months ended September 30, 2017 and 2016, respectively.

New Accounting Pronouncements

New accounting pronouncements: In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance creating Accounting Standards Codification (“ASC”) Section 606, “Revenue from Contracts with Customers.” The new section will replace ASC Section 605, “Revenue Recognition,” and creates modifications to various other revenue accounting standards for specialized transactions and industries. The section is intended to conform revenue accounting principles with a concurrently issued International Financial Reporting Standards with previously differing treatment between U.S. practice and that of much of the rest of the world, as well as to enhance disclosures related to disaggregated revenue information. Entities will have the option to apply the standard retrospectively to all prior periods presented (“full retrospective”), or to apply it retrospectively only to contracts existing at the effective date (“modified retrospective”), with the cumulative effect of the standard recorded as an adjustment to beginning retained earnings. The updated guidance will be effective for public business entities for fiscal years beginning after December 15, 2017, and interim periods within that year. The Company is currently evaluating which of the alternative approaches it will apply and the potential impact of adoption of the revised revenue standards on its financial statements. The Company intends to complete its evaluation during its fiscal year ending June 30, 2018.

In July 2015, FASB issued ASU 2015-11, “Inventory (Topic 330) Related to Simplifying the Measurement of Inventory,” which applies to all inventory except that which is measured using last-in, first-out (“LIFO”) or the retail inventory method. Inventory measured using first-in, first-out (“FIFO”) or average cost is within the scope of the new guidance and should be measured at the lower of cost and net realizable value. Net realizable value is the estimated selling price in the ordinary course of business, less reasonably predictable cost of completion, disposal, and transportation. Subsequent measurement is unchanged for inventory measured using LIFO or the retail inventory method. The amendments are effective for public business entities for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. The new guidance is applied prospectively, and earlier application is permitted as of the beginning of an interim or annual reporting period. The Company adopted ASU 2015-11 effective July 1, 2017, which had no material impact on its financial statements or financial statement disclosures.

In February 2016, FASB issued ASU 2016-02, “Leases (Topic 842).” This standard requires the recognition of all lease transactions with terms in excess of 12 months on the balance sheet as a lease liability and a right-of-use asset (as defined in the standard). ASU 2016-02 will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with earlier application permitted. Upon adoption, the lessee will apply the new standard retrospectively to all periods presented or retrospectively using a cumulative effect adjustment in the year of adoption. The Company has evaluated that ASU 2016-02 will have no material impact on its financial statements or financial statement disclosures upon adoption based on current facts and circumstances.

In March 2016, FASB issued ASU 2016-09, “Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting,” which reduces complexity in accounting standards related to share-based payment transactions, including, among others, (1) accounting for income taxes, (2) classification of excess tax benefits on the statement of cash flow, (3) forfeitures, and (4) statutory tax withholding requirements. ASU 2016-09 is effective for annual reporting periods beginning on or after December 15, 2016, and interim periods within those annual periods. The Company adopted ASU 2016-09 effective July 1, 2017, which had no material impact on its previously reported financial statements in the Company’s Annual Report on Form 10-K for fiscal 2017. The Company has elected to continue to recognize estimated forfeitures as stock-based compensation expense.