Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Details)

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Note 12 - Segment Reporting - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
 3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2023
Revenue from external customers $ 35,476,000 $ 34,230,000 $ 34,230,000
Revenue from internal customers (Clearfield, Inc.) 0 0  
Net investment income 1,744,000 2,069,000  
Interest expense 100,000 126,000  
Depreciation and amortization 1,838,000 1,651,000  
Stock based compensation 1,139,000 1,271,000  
Income tax benefit (426,000) (951,000)  
Net income (loss) (1,906,000) (5,268,000)  
Capital expenditures 2,069,000 2,352,000  
Intersegment Eliminations [Member]      
Revenue from external customers 0 0  
Revenue from internal customers (Clearfield, Inc.) (666,000) (883,000)  
Net investment income (60,000) (60,000)  
Interest expense (62,000) (58,000)  
Depreciation and amortization 0 0  
Stock based compensation 0 0  
Income tax benefit 0 0  
Net income (loss) 26,000 (126,000)  
Capital expenditures 0 0  
Clearfield [Member] | Operating Segments [Member]      
Revenue from external customers 29,698,000 28,101,000  
Revenue from internal customers (Clearfield, Inc.) 0 0  
Net investment income 1,804,000 2,127,000  
Interest expense 0 0  
Depreciation and amortization 1,513,000 1,297,000  
Stock based compensation 1,050,000 1,222,000  
Income tax benefit 53,000 (583,000)  
Net income (loss) (494,000) (3,383,000)  
Capital expenditures 1,751,000 1,227,000  
Nestor Cables [Member] | Operating Segments [Member]      
Revenue from external customers 6,444,000 6,129,000  
Revenue from internal customers (Clearfield, Inc.) 666,000 883,000  
Net investment income 0 2,000  
Interest expense 162,000 184,000  
Depreciation and amortization 325,000 354,000  
Stock based compensation 89,000 49,000  
Income tax benefit (479,000) (368,000)  
Net income (loss) (1,438,000) (1,759,000)  
Capital expenditures $ 318,000 $ 1,125,000