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Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Total spectrum revenue $ 1,552 $ 1,551 $ 2,970 $ 3,076
Operating expenses        
General and administrative 8,398 11,397 18,847 24,248
Sales and support 1,449 1,357 2,942 3,207
Product development 1,212 1,776 2,332 3,526
Severance and other related charges 735 0 1,355 0
Depreciation and amortization 133 151 257 330
Operating expenses 11,927 14,681 25,733 31,311
Gain on exchange of intangible assets, net (59,602) 0 (93,518) (93)
Gain on sale of intangible assets, net (11,469) 0 (12,430) 0
Loss from disposal of long-lived assets, net 21 0 29 0
Income (loss) from operations 60,675 (13,130) 83,156 (28,142)
Interest income 379 585 821 1,279
Other income 0 9 0 25
Income (loss) before income taxes 61,054 (12,536) 83,977 (26,838)
Income tax expense 7,518 230 5,261 1,452
Net income (loss) $ 53,536 $ (12,766) $ 78,716 $ (28,290)
Net income (loss) per common share basic (in dollars per share) $ 2.86 $ (0.69) $ 4.22 $ (1.53)
Net income (loss) per common share diluted (in dollars per share) $ 2.86 $ (0.69) $ 4.21 $ (1.53)
Weighted-average common shares used to compute basic net income (loss) per share (in shares) 18,687,082 18,586,075 18,654,570 18,531,169
Weighted-average common shares used to compute diluted net income (loss) per share (in shares) 18,705,801 18,586,075 18,710,311 18,531,169