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Note 12 - Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Revenue from external customers | $ 34,230,000 | $ 85,942,000
Revenue from internal customers (Clearfield, Inc.) | 0 | 0
Net investment income | 2,069,000 | 303,000
Interest expense | 126,000 | 243,000
Depreciation and amortization | 1,695,000 | 1,353,000
Stock based compensation | 1,271,000 | 660,000
Income taxes | (951,000) | 3,695,000
Net loss | (5,268,000) | 14,255,000
Capital expenditures | 2,352,000 | 1,984,000
Intersegment Eliminations [Member] |  |
Revenue from external customers | 0 | 0
Revenue from internal customers (Clearfield, Inc.) | (883,000) | (1,186,000)
Net investment income | (60,000) | 0
Interest expense | (58,000) | 0
Depreciation and amortization | 0 | 0
Stock based compensation | 0 | 0
Income taxes | 0 | 0
Net loss | (126,000) | (153,000)
Capital expenditures | 0 | 0
Clearfield [Member] | Operating Segments [Member] |  |
Revenue from external customers | 28,101,000 | 78,355,000
Revenue from internal customers (Clearfield, Inc.) | 0 | 0
Net investment income | 2,127,000 | 301,000
Interest expense | 0 | 170,000
Depreciation and amortization | 1,340,000 | 1,009,000
Stock based compensation | 1,222,000 | 660,000
Income taxes | (583,000) | 3,773,000
Net loss | (3,383,000) | 14,718,000
Capital expenditures | 1,227,000 | 1,787,000
Nestor Cables [Member] | Operating Segments [Member] |  |
Revenue from external customers | 6,129,000 | 7,587,000
Revenue from internal customers (Clearfield, Inc.) | 883,000 | 1,186,000
Net investment income | 2,000 | 2,000
Interest expense | 184,000 | 73,000
Depreciation and amortization | 355,000 | 344,000
Stock based compensation | 49,000 | 0
Income taxes | (368,000) | (78,000)
Net loss | (1,759,000) | (310,000)
Capital expenditures | $ 1,125,000 | $ 198,000

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