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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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