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Aggregate grant date fair value of options vested.

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Number of fully vested and expected to vest equity-based compensation awards outstanding that can be converted into shares under option plan.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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- Details

Name:	us-gaap_PlanNameAxis=lyts_The2012StockIncentivePlanMember
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Note 9 - Equity Compensation (Details Textual)		1 Months Ended	3 Months Ended	12 Months Ended				63 Months Ended
Note 9 - Equity Compensation (Details Textual)	Feb. 21, 2017 shares	Nov. 30, 2016 shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2016 USD ($) $ / shares shares	Jun. 30, 2015 shares	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				7 years	7 years 146 days	6 years 219 days	6 years 36 days
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares			1,436,303	1,436,303
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance \| shares			3,298,677	3,298,677	3,119,688	2,976,490	2,677,436
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number \| shares			1,824,552	1,824,552	1,277,561	1,312,985
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total \| $			$ 1,052,342	$ 1,052,342
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 240 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares				794,537	1,332,623	1,026,800
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares				$ 5.98	$ 10.59	$ 9.39
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 1.73	$ 3.67	$ 3.64
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				5 years 292 days	5 years	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares				467,609	702,979	165,800
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate			8.70%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number \| shares			2,918,382	2,918,382
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price \| $ / shares			$ 8.33	$ 8.33
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value \| $			$ 8,037	$ 8,037
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term				6 years 255 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value \| $				$ 39,011	$ 1,189,414	$ 1,695,213
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Aggregate Grant Date Fair Value \| $				3,192,672	2,298,114	1,168,192
Proceeds from Stock Options Exercised \| $				285,875	2,945,986	4,124,047
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise \| $				116,602	505,879	595,483
Reduction of Deferred Tax Asset Related to Stock Option Exercises \| $				292,000	261,694	102,010
Reduction of Income Tax Expense Related to Stock Option Exercises \| $				$ 10,767	$ 138,722	$ 141,349
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period \| shares				41,388	40,092	23,838
Stock Issued During Period, Value, Share-based Compensation, Gross \| $				$ 312,000	$ 409,000	$ 248,000
Deferred Compensation Plan, Number of Participants			32	32
Treasury Stock, Shares, Ending Balance \| shares			241,996	241,996	257,898
Treasury Stock, Value, Ending Balance \| $			$ 2,110,248	$ 2,110,248	$ 2,456,875
Deferred Compensation Arrangement with Individual, Shares Issued \| shares				67,138	0	0
Employee Salary Deferrals or Company Contributions [Member]
Treasury Stock, Value, Acquired, Cost Method \| $				$ 106,537	$ 492,400
Treasury Stock, Shares, Acquired \| shares				15,225	50,579
Former CEO [Member]
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost \| $				$ 954,000
Atlas Lighting Products, Inc. [Member]
Number of Stock Warrants Issued \| shares	200,000			200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares					$ 9.95
Class of Warrant or Right, Exercise Price of Warrants or Rights, Fair value \| $ / shares					2.87
Class of Warrant or Right, Remaining Contractual Life				3 years 255 days
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				10 years
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares				$ 6.54	11.06	$ 11.87
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 1.96	$ 3.83	$ 4.52
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				10 years	10 years	9 years 255 days
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate								8.79%
Minimum [Member]
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price \| $ / shares				$ 5.92	$ 9.15	$ 8.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 1.71	$ 3.01	$ 3.28
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				9 years	9 years	9 years
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate								2.00%
Service-based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years	4 years
Performance-based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				3 years
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total \| $			$ 246,301	$ 246,301
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 270 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance \| shares			169,397	169,397	133,335
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value \| $ / shares				$ 5.92	$ 10.84
Share Based Compensation Valuation Assumptions Expected Forfeiture Rate				8.30%	3.40%
Allocated Share-based Compensation Expense, Total \| $				$ 879,613	$ 570,178
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				91,490	96,210
Dividends, Total \| $				$ 50,621	$ 30,067
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms				4 years 182 days	6 years
Share-based Compensation Arrangement By Share-based Payment Award, Equity Other Than Options, Vested and Expected To Vest, Outstanding, Number \| shares			165,680	165,680	128,859
Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares				345,560	425,000
Employee Stock Option [Member]
Allocated Share-based Compensation Expense, Total \| $				$ 2,147,423	$ 2,478,861	$ 2,519,092
The 2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized \| shares		1,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio		2.5