Fair value of exercise price per share or per unit of warrants or rights outstanding.

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The remaining contractual life of warrants.

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Represents the number of participants in the Company's non-qualified deferred compensation plan.

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Amount of tax benefit from disqualifying dispositions of stock options granted under share-based compensation arrangement.

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The amount of increase (decrease) to common stock relating to stock option exercises.

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The number of stock warrants issued during the period.

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Reduction or Increase of income tax expense related to the exercises of stock options in which the employees sold the common shares prior to the passage of 12 months from the date of exercise.

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Reduction of federal income taxes payable related to the exercises of stock options in which the employees sold the common shares prior to the passage of 12 months from the date of exercise.

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Reduction of income tax expense related to the exercises of stock options in which the employees sold the common shares prior to the passage of 12 months from the date of exercise.

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No definition available.

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Aggregate grant date fair value of options vested.

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The estimated forfeiture rate used in the calculation of stock option expense for the period.

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As of the balance sheet date, the number of shares expected to vest.

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Represents the net repurchases of common shares expected to be made in the upcoming fiscal year or, if the information is not presented as of year-end, expected to be made during the remainder of the current fiscal year.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of warrants or rights outstanding.

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of share instruments newly issued under a share-based compensation plan.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Percentage of vesting of share-based compensation awards.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Gross value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP). Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Note 9 - Equity Compensation (Details Textual)		3 Months Ended		12 Months Ended					51 Months Ended
Note 9 - Equity Compensation (Details Textual)	Feb. 21, 2017 shares	Jun. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2017 $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 shares	Mar. 31, 2017 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				5 years		4 years	4 years 109 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				7 years 146 days		6 years 219 days	6 years 36 days	5 years 146 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares		2,188,509		2,188,509
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number \| shares		3,119,688		3,119,688	2,976,490	2,976,490	2,677,436	2,677,464
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number \| shares		1,277,561		1,277,561	1,312,985	1,312,985	1,597,238
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 3,065,300		$ 3,065,300
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				2 years
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate		3.10%
Stock or Unit Option Plan Expense				$ 2,478,861		$ 2,519,092	$ 1,238,897
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number \| shares		3,067,295		3,067,295
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price \| $ / shares		$ 9.11		$ 9.11
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value		$ 2,322,190		$ 2,322,190
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term				7 years 36 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value				$ 2,298,114		1,168,192	822,827
Proceeds from Stock Options Exercised				2,612,000		4,021,000	$ 850,000
Employee Service Share-based Compensation, Tax Benefit from Disqualifying Dispositions of Stock Options				138,722		141,394
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise				505,879		595,483
Increase (Decrease) In Common Stock Related To Stock Option Exercise				(261,694)		(102,010)
Reduction of Income Tax Expense Related to Stock Option Exercises				138,722		141,349
Reduction of Deferred Tax Asset Related to Stock Option Exercises				$ 628,852		$ 556,144
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares				1,332,623		1,026,800	734,323
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares				$ 10.59		$ 9.39	$ 6.83
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 3.67		$ 3.64	$ 3.27
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 1,189,414		$ 1,695,213	$ 212,106
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period \| shares				40,092		23,838	26,850
Stock Issued During Period, Value, Share-based Compensation, Gross				$ 409,000		$ 248,000	$ 191,000
Deferred Compensation Plan, Number of Participants		33		33
Treasury Stock, Shares \| shares		257,898		257,898	228,100	228,100
Treasury Stock, Value		$ 2,456,875		$ 2,456,875	$ 2,167,717	$ 2,167,717
Treasury Stock, Value, Acquired, Cost Method				$ 276,000		$ 23,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares				702,979		165,800	571,275
Employee Salary Deferrals or Company Contributions [Member]
Treasury Stock, Value, Acquired, Cost Method				$ 492,400		$ 363,400
Treasury Stock, Shares, Acquired \| shares				50,579		36,685
Excluding Tax Effect of Disqualified Dispositions [Member]
Proceeds from Stock Options Exercised				$ 2,945,946		$ 4,124,047	$ 1,092,002
Atlas Lighting Products, Inc. [Member]
Number of Stock Warrants Issued \| shares	200,000		200,000
Class of Warrant or Right, Outstanding \| shares		200,000		200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares			$ 9.95						$ 9.95
Class of Warrant or Right, Exercise Price of Warrants or Rights, Fair value \| $ / shares			$ 2.87						$ 2.87
Class of Warrant or Right, Remaining Contractual Life				4 years 255 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				10 years		9 years 255 days	9 years 292 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				10 years
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate									3.30%
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares				$ 11.06		$ 11.87	$ 8.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 3.83		$ 4.52	$ 3.89
Treasury Stock Acquired, Repurchase Authorization, Shares Expected \| shares		95,000		95,000
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				9 years		9 years	9 years 153 days
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate									2.00%
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares				$ 9.15		$ 8.84	$ 5.96
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 3.01		$ 3.28	$ 2.19
Treasury Stock Acquired, Repurchase Authorization, Shares Expected \| shares		85,000		85,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Dividends				$ 30,067		$ 10,625
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number \| shares		133,335		133,335	62,500	62,500
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms				6 years	3 years
Allocated Share-based Compensation Expense				$ 570,178	$ 383,483
Sharebased Compensation Arrangement By Sharebased Payment Award Equity Other Than Options Expected To Vest Outstanding Number \| shares		128,859		128,859	60,794	60,794
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized		$ 234,320		$ 234,320
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				2 years 240 days
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate				3.40%		3.30%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				96,210		72,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 10.84		$ 9.39
Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares				425,000
Annually [Member] \| Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				33.30%
Non-Employee Directors [Member] \| Each Ninety Days [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				25.00%
Employees [Member] \| Annually [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				25.00%