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Inventories - Schedule Of Retrospective Application of Change In Accounting Method Of Inventory (Detail) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
ASSETS |  |  |
Inventories, net | $ 25,366,000 | $ 21,890,000 | [1]
Prepaid expenses | 499,000 | 1,348,000 | [1]
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred and other income taxes | 3,372,000 | 2,640,000 | [1]
Retained earnings | 141,897,000 | 131,701,000 | [1]
Consolidated Income Statements |  |  |
Cost of goods sold | 58,917,000 | 71,818,000 | [2]
Income before income tax expense | 12,824,000 | 15,064,000 | [2]
Income tax expense | 2,628,000 | 2,370,000 | [2]
Net income | $ 10,196,000 | $ 12,694,000 | [3]
Basic earnings per common share | $ 0.70 | $ 0.88 | [2]
Diluted earnings per common share | $ 0.69 | $ 0.86 | [2]
Consolidated Statements of Cash Flows |  |  |
Net income | $ 10,196,000 | $ 12,694,000 | [2]
Deferred and other income taxes | (732,000) | (262,000) | [2]
Inventories | 3,476,000 | 1,702,000 | [2]
Accrued expenses | $ 575,000 | (357,000) | [2]
Previously Reported [Member] |  |  |
ASSETS |  |  |
Inventories, net |  | 18,214,000 |
Prepaid expenses |  | 1,904,000 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred and other income taxes |  | 2,358,000 |
Retained earnings |  | 128,863,000 |
Consolidated Income Statements |  |  |
Cost of goods sold |  | 71,993,000 |
Income before income tax expense |  | 14,889,000 |
Income tax expense |  | 2,325,000 |
Net income |  | $ 12,564,000 |
Basic earnings per common share |  | $ 0.87 |
Diluted earnings per common share |  | $ 0.85 |
Consolidated Statements of Cash Flows |  |  |
Net income |  | $ 12,564,000 |
Deferred and other income taxes |  | 757,000 |
Inventories |  | (1,527,000) |
Prepaid expenses |  | (244,000) |
Accrued expenses |  | (341,000) |
Restatement Adjustment [Member] |  |  |
ASSETS |  |  |
Inventories, net |  | 3,676,000 |
Prepaid expenses |  | (556,000) |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred and other income taxes |  | 282,000 |
Retained earnings |  | 2,838,000 |
Consolidated Income Statements |  |  |
Cost of goods sold |  | (175,000) |
Income before income tax expense |  | 175,000 |
Income tax expense |  | 45,000 |
Net income |  | $ 130,000 |
Basic earnings per common share |  | $ 0.01 |
Diluted earnings per common share |  | $ 0.01 |
Consolidated Statements of Cash Flows |  |  |
Net income |  | $ 130,000 |
Deferred and other income taxes |  | (495,000) |
Inventories |  | (175,000) |
Prepaid expenses |  | 556,000 |
Accrued expenses |  | (16,000) |
As Reported Under FIFO [Member] |  |  |
ASSETS |  |  |
Inventories, net |  | 21,890,000 |
Prepaid expenses |  | 1,348,000 |
LIABILITIES AND SHAREHOLDERS' EQUITY |  |  |
Deferred and other income taxes |  | 2,640,000 |
Retained earnings |  | 131,701,000 |
Consolidated Income Statements |  |  |
Cost of goods sold |  | 71,818,000 |
Income before income tax expense |  | 15,064,000 |
Income tax expense |  | 2,370,000 |
Net income |  | $ 12,694,000 |
Basic earnings per common share |  | $ 0.88 |
Diluted earnings per common share |  | $ 0.86 |
Consolidated Statements of Cash Flows |  |  |
Net income |  | $ 12,694,000 |
Deferred and other income taxes |  | 262,000 |
Inventories |  | (1,702,000) |
Prepaid expenses |  | 312,000 |
Accrued expenses |  | $ (357,000) |
[1] | The amounts as of September 30, 2018 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.
[2] | The amounts for the year ended September 30, 2018 have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.
[3] | The balances as of September 30, 2017 and 2018, and the amounts for the year ended September 30, 2018, have been adjusted to reflect the change in inventory accounting method, as described in Notes 1 and 2 to the Consolidated Financial Statements.

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