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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Total
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Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | 8,851,677 |  |  | 1,626,605 |  |
Balance (Accounting Standards Update 2016-02 [Member]) at Jun. 30, 2019 |  |  | $ 420 |  |  | $ 420 |  |  |  |  |  |
Balance at Jun. 30, 2019 |  |  |  |  |  |  | $ 87 | $ 26,280 | $ 57,380 | $ (7,955) | $ 292 | $ 76,084
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  | 159,668 |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ (1,332) |  | $ (1,332)
Issuance of common stock for stock option exercise (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0
Issuance of common stock for stock option exercise |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss resulting from change in fair value of derivative instruments, net of tax |  |  |  |  |  |  |  |  |  |  | (516) | (516)
Net income |  |  |  |  |  |  |  |  | 572 |  |  | 572
Issuance of common stock for restricted stock grants (in shares) |  |  |  |  |  |  | 5,000 |  |  |  |  |
Issuance of common stock for restricted stock grants |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to stock compensation plans |  |  |  |  |  |  |  | 892 |  |  |  | 892
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 8,856,677 |  |  | 1,801,273 |  |
Balance at Dec. 31, 2019 |  |  |  |  |  |  | $ 87 | 27,172 | 58,500 | $ (9,287) | (352) | 76,120
Forfeiture of restricted stock (in shares) |  |  |  |  |  |  |  |  |  | 15,000 |  |
Forfeiture of restricted stock |  |  |  |  |  |  |  |  |  |  |  |
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  |  |  |  |  |  |  |  | 128 |  | (128) |
Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | 8,851,677 |  |  | 1,643,322 |  |
Balance at Sep. 30, 2019 |  |  |  |  |  |  | $ 87 | 26,713 | 58,024 | $ (7,970) | 551 | 77,405
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  | 157,951 |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ (1,317) |  | $ (1,317)
Issuance of common stock for stock option exercise (in shares) |  |  |  |  |  |  |  |  |  |  |  | 0
Unrealized loss resulting from change in fair value of derivative instruments, net of tax |  |  |  |  |  |  |  |  |  |  | (903) | $ (903)
Net income |  |  |  |  |  |  |  |  | 476 |  |  | 476
Issuance of common stock for restricted stock grants (in shares) |  |  |  |  |  |  | 5,000 |  |  |  |  |
Issuance of common stock for restricted stock grants |  |  |  |  |  |  |  |  |  |  |  |
Compensation expense related to stock compensation plans |  |  |  |  |  |  |  | 459 |  |  |  | 459
Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | 8,856,677 |  |  | 1,801,273 |  |
Balance at Dec. 31, 2019 |  |  |  |  |  |  | $ 87 | 27,172 | 58,500 | $ (9,287) | (352) | 76,120
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  | 8,856,677 |  |  | 2,104,305 |  |
Balance at Jun. 30, 2020 |  |  |  |  |  |  | $ 87 | 27,992 | 56,181 | $ (11,702) | (1,183) | 71,375
Compensation expense related to stock compensation plans |  |  |  |  |  |  |  | 698 |  |  |  | 698
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  | 418,949 |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ (3,501) |  | $ (3,501)
Issuance of common stock for stock option exercise (in shares) |  |  |  |  |  |  | 30,442 |  |  |  |  | 100,000
Issuance of common stock for stock option exercise |  |  |  |  |  |  | $ 1 | (1) |  |  |  |
Unrealized loss resulting from change in fair value of derivative instruments, net of tax |  |  |  |  |  |  |  |  |  |  | (1,974) | (1,974)
Net income |  |  |  |  |  |  |  |  | 5,890 |  |  | 5,890
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 8,887,119 |  |  | 2,523,254 |  |
Balance at Dec. 31, 2020 |  |  |  |  |  |  | $ 88 | 28,689 | 62,071 | $ (15,203) | (3,157) | 72,488
Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | 8,856,677 |  |  | 2,340,387 |  |
Balance at Sep. 30, 2020 |  |  |  |  |  |  | $ 87 | 28,353 | 58,439 | $ (13,445) | (2,303) | 71,131
Compensation expense related to stock compensation plans |  |  |  |  |  |  |  | 337 |  |  |  | 337
Repurchase of common stock (in shares) |  |  |  |  |  |  |  |  |  | 182,867 |  |
Repurchase of common stock |  |  |  |  |  |  |  |  |  | $ (1,758) |  | $ (1,758)
Issuance of common stock for stock option exercise (in shares) |  |  |  |  |  |  | 30,442 |  |  |  |  | 100,000
Issuance of common stock for stock option exercise |  |  |  |  |  |  | $ 1 | (1) |  |  |  |
Unrealized loss resulting from change in fair value of derivative instruments, net of tax |  |  |  |  |  |  |  |  |  |  | (854) | (854)
Net income |  |  |  |  |  |  |  |  | 3,632 |  |  | 3,632
Balance (in shares) at Dec. 31, 2020 |  |  |  |  |  |  | 8,887,119 |  |  | 2,523,254 |  |
Balance at Dec. 31, 2020 |  |  |  |  |  |  | $ 88 | $ 28,689 | $ 62,071 | $ (15,203) | $ (3,157) | $ 72,488

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