Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Details)

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Note 11 - Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Sep. 30, 2022
Revenue from external customers $ 85,942,000 $ 51,109,000  
Revenue from internal customers (Clearfield, Inc.) 0    
Net investment income 303,000    
Interest expense 243,000    
Depreciation and amortization 1,353,000 639,000  
Stock based compensation 660,000 440,000  
Income taxes 3,695,000 2,780,000  
Net income (loss) 14,255,000 $ 10,389,000  
Capital expenditures 1,984,000    
Goodwill 6,545,000   $ 6,402,000
Total assets 351,797,000   $ 229,128,000
Intersegment Eliminations [Member]      
Revenue from external customers 0    
Revenue from internal customers (Clearfield, Inc.) (1,186,000)    
Net investment income 0    
Interest expense 0    
Depreciation and amortization 0    
Stock based compensation 0    
Income taxes 0    
Net income (loss) (153,000)    
Capital expenditures 0    
Goodwill 0    
Total assets (17,360,000)    
Clearfield [Member] | Operating Segments [Member]      
Revenue from external customers 78,355,000    
Revenue from internal customers (Clearfield, Inc.) 0    
Net investment income 301,000    
Interest expense 170,000    
Depreciation and amortization 1,009,000    
Stock based compensation 660,000    
Income taxes 3,773,000    
Net income (loss) 14,718,000    
Capital expenditures 1,787,000    
Goodwill 4,709,000    
Total assets 334,465,000    
Nestor Cables [Member] | Operating Segments [Member]      
Revenue from external customers 7,587,000    
Revenue from internal customers (Clearfield, Inc.) 1,186,000    
Net investment income 2,000    
Interest expense 73,000    
Depreciation and amortization 344,000    
Stock based compensation 0    
Income taxes (78,000)    
Net income (loss) (310,000)    
Capital expenditures 197,000    
Goodwill 1,836,000    
Total assets $ 34,692,000