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Note 20 - Summary of Significant Accounting Policies - Revision of Previously Issued Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2025
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Total revenue $ 159,192 $ 143,855 $ 143,338 $ 147,436 $ 150,604 $ 144,292 $ 136,355 $ 142,197 $ 290,774 $ 278,552 $ 434,629 $ 422,844 $ 593,821 $ 573,448 $ 551,486
Total cost of revenue 86,918 77,451 80,555 78,617 82,117 79,702 76,579 80,428 159,172 157,007 236,623 236,709 323,541 318,826 312,276
Gross profit 72,274 66,404 62,783 68,819 68,487 64,590 59,776 61,769 131,602 121,545 198,006 186,135 270,280 254,622 239,210
Research and development 8,258 7,417 7,602 7,113 7,539 7,588 8,410 7,987 14,715 16,397 22,132 23,985 30,390 31,524 32,141
Selling, general and administrative 61,709 60,083 69,795 69,976 64,734 62,407 67,960 67,857 139,771 135,817 199,854 198,224 261,563 262,958 263,738
Goodwill and Intangible Asset Impairment         0 0 4,658 0         0 4,658 0
Restructuring charges 406 754 3,580 431 851 1,701 3,428 786         5,171 6,766 4,577
Total operating expenses 70,373 68,254 80,977 77,520 73,124 71,696 84,456 76,630 158,497 161,086 226,751 232,782 297,124 305,906 300,456
Operating loss 1,901 (1,850) (18,194) (8,701) (4,637) (7,106) (24,680) (14,861) (26,895) (39,541) (28,745) (46,647) (26,844) (51,284) (61,246)
Interest income, net 5,019 4,973 4,489 4,298 5,532 7,925 9,479 9,955         18,779 32,891 43,541
Other Nonoperating Income (Expense) (620) (820) 1,158 1,204 (604) (378) (268) 518         922 (732) (2,300)
Loss from continuing operations before income taxes 6,300 2,303 (12,547) (3,199) 291 443 (15,469) (4,390) (15,746) (19,859) (13,443) (19,416) (7,143) (19,125) (20,005)
Income tax (benefit) expense (45,353) 2,635 7,243 3,874 2,036 573 1,292 1,340 11,117 2,632 13,752 3,205 (31,601) 5,241 (11,965)
Loss from continuing operations 51,653 (332) (19,790) (7,073) (1,745) (130) (16,761) (5,730) (26,863) (22,491) (27,195) (22,621) 24,458 (24,366) (8,040)
Loss from discontinued operations, net of tax (776) (47,655) (27,871) (3,919) (4,894) (6,424) (120,681) (8,532) (31,790) (129,213) (79,445) (135,637) (80,221) (140,531) (6,596)
Net loss $ 50,877 $ (47,987) $ (47,661) $ (10,992) $ (6,639) $ (6,554) $ (137,442) $ (14,262) $ (58,653) $ (151,704) $ (106,640) $ (158,258) $ (55,763) $ (164,897) $ (14,636)
Loss from continuing operations (in dollars per share) $ 1.13 $ (0.01) $ (0.43) $ (0.16) $ (0.04) $ 0 $ (0.3) $ (0.1) $ (0.59) $ (0.4) $ (0.59) $ (0.41) $ 0.53 $ (0.46) $ (0.12)
Loss from discontinued operations, net of tax (in dollars per share) (0.02) (1.04) (0.61) (0.09) (0.1) (0.12) (2.18) (0.15) (0.7) (2.3) (1.74) (2.47) (1.75) (2.64) (0.1)
Basic net loss per share (in dollars per share) 1.11 (1.05) (1.04) (0.25) (0.14) (0.12) (2.48) (0.25) (1.29) (2.7) (2.33) (2.88) (1.22) (3.1) (0.22)
Income (loss) from continuing operations (in dollars per share) 1.12 (0.01) (0.43) (0.16) (0.04) 0 (0.3) (0.1) (0.59) (0.4) (0.59) (0.41) 0.53 (0.46) (0.12)
Loss from discontinued operations, net of tax (in dollars per share) (0.02) (1.04) (0.61) (0.09) (0.1) (0.12) (2.18) (0.15) (0.7) (2.3) (1.74) (2.47) (1.75) (2.64) (0.1)
Diluted net loss per share (in dollars per share) $ 1.11 $ (1.05) $ (1.04) $ (0.25) $ (0.14) $ (0.12) $ (2.48) $ (0.25) $ (1.29) $ (2.7) $ (2.33) $ (2.88) $ (1.22) $ (3.1) $ (0.22)
Weighted average common shares outstanding used in computing basic loss per share (in shares) 45,833 45,780 45,732 45,626 48,079 52,963 55,440 56,709 45,658 56,078 45,712 54,914 45,743 53,175 66,253
Weighted average common shares outstanding used in computing diluted loss per share (in shares) 45,994 45,780 45,732 45,626 48,079 52,963 55,440 56,709 45,658 56,078 45,712 54,914 45,896 53,175 66,253
Previously Reported [Member]                              
Total revenue $ 159,192 $ 143,942 $ 143,418 $ 147,510 $ 150,826 $ 144,292 $ 136,355 $ 141,725 $ 290,928 $ 278,080 $ 434,870 $ 422,372   $ 573,198 $ 551,950
Total cost of revenue 86,918 76,182 77,532 78,839 81,239 78,814 75,691 79,982 156,371 155,673 232,553 234,487   315,726 309,323
Gross profit 72,274 67,760 65,886 68,671 69,587 65,478 60,664 61,743 134,557 122,407 202,317 187,885   257,472 242,627
Research and development 8,258 6,685 6,869 6,380 6,864 6,911 7,733 7,313 13,249 15,046 19,934 21,957   28,821 29,910
Selling, general and administrative 61,709 61,035 71,588 73,213 64,869 63,972 69,058 69,889 144,801 138,947 205,836 202,919   267,788 268,922
Total operating expenses 70,373 68,474 82,037 80,024 72,584 72,584 84,877 77,988 162,061 162,865 230,535 235,449   308,033 303,409
Operating loss 1,901 (714) (16,151) (11,353) (2,997) (7,106) (24,213) (16,245) (27,504) (40,458) (28,218) (47,564)   (50,561) (60,782)
Loss from continuing operations before income taxes 6,300 3,438 (10,505) (5,852) 1,929 443 (15,002) (5,772) (16,357) (20,774) (12,919) (20,332)   (18,402) (19,541)
Income tax (benefit) expense (45,353) 2,758 7,680 3,569 2,017 600 1,200 1,420 11,249 2,620 14,007 3,220   5,237 (11,880)
Loss from continuing operations 51,653 680 (18,185) (9,421) (88) (157) (16,202) (7,192) (27,606) (23,394) (26,926) (23,552)   (23,639) (7,661)
Loss from discontinued operations, net of tax (776) (53,486) (22,271) (3,919) (4,897) (6,424) (120,678) (8,532) (26,190) (129,210) (79,676) (135,634)   (140,531) (6,596)
Net loss $ 50,877 $ (52,806) $ (40,456) $ (13,340) $ (4,985) $ (6,581) $ (136,880) $ (15,724) $ (53,796) $ (152,604) $ (106,602) $ (159,186)   $ (164,170) [1] $ (14,257) [1]
Loss from continuing operations (in dollars per share) $ 1.13 $ 0.01 $ (0.4) $ (0.21) $ 0 $ 0 $ (0.29) $ (0.13) $ (0.6) $ (0.42) $ (0.59) $ (0.43)   $ (0.44) $ (0.12)
Loss from discontinued operations, net of tax (in dollars per share) (0.02) (1.17) (0.49) (0.09) (0.1) (0.12) (2.18) (0.15) (0.57) (2.3) (1.74) (2.47)   (2.64) (0.1)
Basic net loss per share (in dollars per share) 1.11 (1.16) (0.89) (0.3) (0.1) (0.12) (2.47) (0.28) (1.17) (2.72) (2.33) (2.9)   (3.08) (0.22)
Income (loss) from continuing operations (in dollars per share) 1.12 0.01 (0.4) (0.21) 0 0 (0.29) (0.13) (0.6) (0.42) (0.59) (0.43)   (0.44) (0.12)
Loss from discontinued operations, net of tax (in dollars per share) (0.02) (1.17) (0.49) (0.09) (0.1) (0.12) (2.18) (0.15) (0.57) (2.3) (1.74) (2.47)   (2.64) (0.1)
Diluted net loss per share (in dollars per share) $ 1.11 $ (1.16) $ (0.89) $ (0.3) $ (0.1) $ (0.12) $ (2.47) $ (0.28) $ (1.17) $ (2.72) $ (2.33) $ (2.9)   $ (3.08) $ (0.22)
Weighted average common shares outstanding used in computing basic loss per share (in shares) 45,833 45,780 45,732 45,626 48,079 52,963 55,440 56,709 45,658 56,078 45,712 54,914   53,175 66,253
Weighted average common shares outstanding used in computing diluted loss per share (in shares) 45,994 45,823 45,732 45,626 48,079 52,963 55,440 56,709 45,658 56,078 45,712 54,914   53,175 66,253
Revision of Prior Period, Adjustment [Member]                              
Total revenue $ 0 $ (87) $ (80) $ (74) $ (222) $ 0 $ 0 $ 472 $ (154) $ 472 $ (241) $ 472   $ 250 $ (464)
Total cost of revenue 0 1,269 3,023 (222) 878 888 888 446 2,801 1,334 4,070 2,222   3,100 2,953
Gross profit 0 (1,356) (3,103) 148 (1,100) (888) (888) 26 (2,955) (862) (4,311) (1,750)   (2,850) (3,417)
Research and development 0 732 733 733 675 677 677 674 1,466 1,351 2,198 2,028   2,703 2,231
Selling, general and administrative 0 (952) (1,793) (3,237) (135) (1,565) (1,098) (2,032) (5,030) (3,130) (5,982) (4,695)   (4,830) (5,184)
Total operating expenses 0 (220) (1,060) (2,504) 540 (888) (421) (1,358) (3,564) (1,779) (3,784) (2,667)   (2,127) (2,953)
Operating loss 0 (1,136) (2,043) 2,652 (1,640) 0 (467) 1,384 609 917 (527) 917   (723) (464)
Loss from continuing operations before income taxes 0 (1,135) (2,042) 2,653 (1,638) 0 (467) 1,382 611 915 (524) 916   (723) (464)
Income tax (benefit) expense 0 (123) (437) 305 19 (27) 92 (80) (132) 12 (255) (15)   4 (85)
Loss from continuing operations 0 (1,012) (1,605) 2,348 (1,657) 27 (559) 1,462 743 903 (269) 931   (727) (379)
Loss from discontinued operations, net of tax 0 5,831 (5,600) 0 3 0 (3) 0 (5,600) (3) 231 (3)   0 0
Net loss $ 0 $ 4,819 $ (7,205) $ 2,348 $ (1,654) $ 27 $ (562) $ 1,462 $ (4,857) $ 900 $ (38) $ 928   $ (727) $ (379)
Loss from continuing operations (in dollars per share) $ 0 $ (0.02) $ (0.03) $ 0.05 $ (0.04) $ 0 $ (0.01) $ 0.03 $ 0.01 $ 0.02 $ 0 $ 0.02   $ (0.02) $ 0
Loss from discontinued operations, net of tax (in dollars per share) 0 0.13 (0.12) 0 0 0 0 0 (0.13) 0 0 0   0 0
Basic net loss per share (in dollars per share) 0 0.11 (0.15) 0.05 (0.04) 0 (0.01) 0.03 (0.12) 0.02 0 0.02   (0.02) 0
Income (loss) from continuing operations (in dollars per share) 0 (0.02) (0.03) 0.05 (0.04) 0 (0.01) 0.03 0.01 0.02 0 0.02   (0.02) 0
Loss from discontinued operations, net of tax (in dollars per share) 0 0.13 (0.12) 0 0 0 0 0 (0.13) 0 0 0   0 0
Diluted net loss per share (in dollars per share) $ 0 $ 0.11 $ (0.15) $ 0.05 $ (0.04) $ 0 $ (0.01) $ 0.03 $ (0.12) $ 0.02 $ 0 $ 0.02   $ (0.02) $ 0
Weighted average common shares outstanding used in computing basic loss per share (in shares)  
Weighted average common shares outstanding used in computing diluted loss per share (in shares)  
Product [Member]                              
Total revenue $ 48,020 $ 39,387 $ 41,955 $ 43,827 $ 47,210 $ 44,028 $ 38,772 $ 43,707 $ 85,782 $ 82,479 $ 125,169 $ 126,507 $ 173,189 $ 173,717 $ 176,100
Total cost of revenue 26,287 19,572 24,994 24,041 28,281 26,481 24,185 26,499 49,035 50,684 68,607 77,165 94,894 105,446 100,775
Product [Member] | Previously Reported [Member]                              
Total revenue 48,020 39,387 41,955 43,827 47,210 44,028 38,772 43,707 85,782 82,479 125,169 126,507   173,717 176,100
Total cost of revenue 26,287 19,592 23,159 25,334 28,120 26,306 24,015 26,783 48,493 50,798 68,085 77,104   105,224 100,775
Product [Member] | Revision of Prior Period, Adjustment [Member]                              
Total revenue 0 0 0 0 0 0 0 0 0 0 0 0   0 0
Total cost of revenue 0 (20) 1,835 (1,293) 161 175 170 (284) 542 (114) 522 61   222 0
Service [Member]                              
Total revenue 111,172 104,468 101,383 103,609 103,394 100,264 97,583 98,490 204,992 196,073 309,460 296,337 420,632 399,731 375,386
Total cost of revenue 60,631 57,879 55,561 54,576 53,836 53,221 52,394 53,929 110,137 106,323 168,016 159,544 $ 228,647 213,380 211,501
Service [Member] | Previously Reported [Member]                              
Total revenue 111,172 104,555 101,463 103,683 103,616 100,264 97,583 98,018 205,146 195,601 309,701 295,865   399,481 375,850
Total cost of revenue 60,631 56,590 54,373 53,505 53,119 52,508 51,676 53,199 107,878 104,875 164,468 157,383   210,502 208,548
Service [Member] | Revision of Prior Period, Adjustment [Member]                              
Total revenue 0 (87) (80) (74) (222) 0 0 472 (154) 472 (241) 472   250 (464)
Total cost of revenue $ 0 $ 1,289 $ 1,188 $ 1,071 $ 717 $ 713 $ 718 $ 730 $ 2,259 $ 1,448 $ 3,548 $ 2,161   $ 2,878 $ 2,953
[1] Revised amounts disclosed in the Company's Annual Report on Form 10-K for the year ended September 30, 2024.