Note 10 - Equity Compensation (Details Textual)	12 Months Ended
Jun. 30, 2021 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) shares	Nov. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) \| shares	318,406
Class of Warrant or Right, Outstanding (in shares) \| shares	200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) \| $ / shares	$ 9.95
Class of Warrant or Right, Remaining Contractual Life (Year)	7 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 200,000	$ 100,000
Proceeds from Stock Options Exercised	987,000	612,000
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise	100,000	43,000
Reduction of Deferred Tax Asset Related to Stock Option Exercises	$ 100,000	$ 400,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) \| shares	43,049	71,581
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture		$ 300,000
Deferred Compensation Plan, Number of Participants	31
Deferred Compensation Arrangement with Individual, Shares Issued (in shares) \| shares	193,510	85,560
Deferred Compensation Plan With Rabbit Trust [Member]
Treasury Stock, Shares, Ending Balance (in shares) \| shares	345,875	180,264
Treasury Stock, Value, Ending Balance	$ 2,500,000	$ 1,100,000
Inducement Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) \| shares	75,000	280,000
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 RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares	30,626
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Inducement PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares	122,509
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	$ 800,000	$ 400,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	1 year 9 months 18 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) \| shares	163,752
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
Share-based Payment Arrangement, Expense	$ 600,000	100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 2 months 12 days
Dividends, Total	$ 42,085	16,931
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 200,000
Restricted Stock Units (RSUs) [Member] \| Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Restricted Stock Units (RSUs) [Member] \| Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Restricted Stock Units (RSUs) [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares	256,526
Share-based Payment Arrangement, Expense	$ 600,000	$ 100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 1,600,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		2 years 1 month 6 days
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) \| $ / shares	$ 7.50
Dividend, Share-based Payment Arrangement, Cash	$ 86,196	$ 46,865
The 2019 Omnibus Award Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) \| shares			2,650,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) \| shares	2,573,450
Share-based Compensation Arrangement by Share-based Payment Award, Fungible Share Ratio	2.5
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) \| shares	163,752
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) \| $ / shares	$ 7.08
The 2019 Omnibus Award Plan [Member] \| Performance Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares	256,526
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) \| $ / shares	$ 7.50

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