Note 12 - Equity Compensation (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2019	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2024	Nov. 30, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 16,300,000	$ 1,300,000	$ 1,700,000
Proceeds from Stock Options Exercised		4,356,000	1,061,000	1,788,000
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise		$ 1,200,000	$ 1,800,000	$ 1,400,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		18,354	27,264	31,608
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture		$ 400,000
Deferred Compensation Arrangement with Individual, Shares Issued (in shares)		89,416	113,176	131,226
Deferred Compensation Plan With Rabbit Trust [Member]
Treasury Stock, Common, Shares (in shares)		1,082,850	1,052,692	1,036,714
Treasury Stock, Value		$ 11,200,000	$ 10,100,000	$ 8,900,000
LSi Employee Stock Purchase Plan (ESPP) [Member]
Employee Stock Ownership Plan (ESOP), Number of Allocated Shares (in shares)		206,000			270,000
Employee Stock Ownership Plan (ESOP), Discounted Purchase Rate					10.00%
Employee Stock Ownership Plan (ESOP), Shares Contributed to ESOP (in shares)		19,000	17,000
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		85,958
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		85,958	107,217
Share-Based Payment Arrangement, Expense		$ 1,300,000	$ 1,300,000	1,500,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 1,500,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 6 months
Dividends		$ 103,679	$ 88,148
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value		$ 2,600,000
Performance Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		203,615
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)		203,614	279,359
Share-Based Payment Arrangement, Expense		$ 2,300,000	$ 2,300,000	2,200,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 2,700,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)		$ 14.3
Service-based Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years
Inducement Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)		10 years
Share-Based Payment Arrangement, Option [Member]
Share-Based Payment Arrangement, Expense		$ 400,000	500,000	$ 100,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount			$ 600,000
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		4 months 24 days
Promissory Shares [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)		9,720
Shares Issued, Value, Share-Based Payment Arrangement, before Forfeiture		$ 200,000
The 2019 Omnibus Award Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	5,000,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)		994,651
The 2019 Omnibus Award Plan [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)		85,958
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)			3 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)		$ 19.54