Note 9 - Equity Compensation (Details Textual)	12 Months Ended
Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($) shares	Nov. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) \| shares	735,429
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)	1 year 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 100,000	$ 0
Proceeds from Stock Options Exercised	612,000	0
Reduction of Federal Income Taxes Payable Related To Stock Option Exercise	43,000	100,000
Reduction of Deferred Tax Asset Related to Stock Option Exercises	$ 400,000	$ 300,000
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) \| shares	71,581	104,020
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture	$ 300,000	$ 400,000
Deferred Compensation Plan, Number of Participants	26
Deferred Compensation Arrangement with Individual, Shares Issued (in shares) \| shares	85,560	74,721
Deferred Compensation Plan With Rabbit Trust [Member]
Treasury Stock, Shares, Ending Balance (in shares) \| shares	180,264	208,965
Treasury Stock, Value, Ending Balance	$ 1,100,000	$ 1,500,000
Inducement Stock Option [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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) \| shares	280,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) \| shares	81,917
Share-based Payment Arrangement, Expense	$ 100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 200,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 36 days
Dividends, Total	$ 16,931	16,848
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	100,000
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Expense	400,000	900,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 1,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 146 days
Performance Stock Units [Member]
Share-based Payment Arrangement, Expense	$ 100,000	100,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 400,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)	2 years 36 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) \| shares	199,310
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	$ 3.83
Dividend, Share-based Payment Arrangement, Cash	$ 46,865	$ 11,310
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	3,907,749
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	81,917	0
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	$ 3.83
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	199,310
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	$ 3.83
The 2019 Omnibus Award Plan [Member] \| Minimum [Member] \| Service-based and Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	3 years
The 2019 Omnibus Award Plan [Member] \| Maximum [Member] \| Service-based and Performance-based Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	10 years
The 2019 Omnibus Award Plan [Member] \| Maximum [Member] \| Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years

The remaining contractual life of warrants.

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

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