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Note 2 - Summary of Significant Accounting Policies - Revision of Previously Issued Financial Statements Policy (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
Sep. 30, 2022
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  
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)  
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)  
Basic (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  
Diluted (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  
Foreign currency translation adjustments   $ 57,098 $ 23,400 $ (47,323)         $ (23,923)   $ 33,176   $ 21,252 $ 54,278 $ 77,246  
Total other comprehensive income (loss), net of tax   22,291 13,050 (41,798)         (28,748)   (6,457)   (8,749) 48,962 21,490  
Comprehensive income (loss)   (25,696) (34,611) (52,790)         (87,401)   (113,097)   (64,512) (115,935) 6,854  
Deferred income taxes       657       $ (7,396) (4,183) $ (9,443) (20,385) $ (12,492) (27,038) (15,886) (28,740)  
Accounts receivable       4,850       2,359 6,713 2,451 38,799 (11,394) 21,039 (12,067) 34,456  
Inventories       (7,622)       4,485 (5,780) 7,794 (9,998) 13,663 (2,671) 15,896 8,253  
Accrued compensation and tax withholdings       (637)       (979) (1,956) (7,831) 3,604 (2,825) 7,427 (2,754) (19,055)  
Other assets and liabilities       11,942       3,306 11,457 1,306 (1,651) 303 (4,275) (2,990) (34,978)  
Net cash provided by operating activities       29,798       13,617 44,201 22,296 70,011 32,069 72,181 49,743 5,834  
Effects of exchange rate changes on cash, cash equivalents and restricted cash       (8,311)       24,687 (4,459) 16,330 4,510 15,678 3,566 21,670 45,990  
Accounts receivable, net of allowance for expected credit losses $ 142,181   146,870 152,259 $ 154,172       146,870       142,181 154,172    
Inventories 74,956 80,847 75,150 74,970 71,320       75,150   80,847   74,956 71,320    
Refundable income taxes 9,728       23,866               9,728 23,866    
Prepaid expenses and other current assets 64,660 74,767 67,214 71,851 51,360       67,214   74,767   64,660 51,360    
Current assets held for sale 73,535   90,696 83,238 99,052       90,696       73,535 99,052    
Total current assets 708,339 678,343 710,371 847,843 833,031       710,371   678,343   708,339 833,031    
Total assets 2,059,582 2,019,000 2,034,015 2,042,771 2,100,265       2,034,015   2,019,000   2,059,582 2,100,265 2,885,345  
Derivative liability 33,420       1,915               33,420 1,915    
Accrued VAT payable         0                 0    
Accrued compensation and benefits 35,799 32,018 26,336 28,541 29,216       26,336   32,018   35,799 29,216    
Accrued income taxes payable 9,416 8,771 10,243 6,852 9,085       10,243   8,771   9,416 9,085    
Accrued Expenses and Other Current Liabilities 30,268       44,449               30,268 44,449    
Total current liabilities 237,674 246,174 221,049 202,524 206,089       221,049   246,174   237,674 206,089    
Long-term tax reserves         0                 0    
Long-term deferred tax liabilities 18,245 20,322 22,314 18,969 18,184       22,314   20,322   18,245 18,184    
Other Liabilities, Noncurrent 11,142       9,272               11,142 9,272    
Total liabilities 332,596 345,979 338,564 322,602 332,418       338,564   345,979   332,596 332,418    
Retained earnings 1,419,956 1,369,081 1,417,065 1,464,727 1,475,719       1,417,065   1,369,081   1,419,956 1,475,719    
Total stockholders' equity 1,726,986 1,673,021 1,695,451 1,720,169 1,767,847       1,695,451   1,673,021   1,726,986 1,767,847 2,534,107 $ 3,363,386
Total liabilities and stockholders' equity 2,059,582 2,019,000 2,034,015 2,042,771 2,100,265       2,034,015   2,019,000   2,059,582 2,100,265    
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)  
Basic (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  
Diluted (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  
Foreign currency translation adjustments   $ 57,321 $ 23,438 $ (47,298)         $ (23,860)   $ 33,462     $ 54,278 $ 77,246  
Total other comprehensive income (loss), net of tax   22,514 13,088 (41,773)         (28,685)   (6,171)     48,962 21,490  
Comprehensive income (loss)   (30,292) (27,368) (55,113)         (82,481)   (112,773)     (115,208) 7,233  
Deferred income taxes       457       $ (7,317) (1,885) $ (9,456) (20,025) $ (12,478)   (16,072) [1] (28,654) [1]  
Accounts receivable       4,850       2,830 6,713 2,922 38,799 (10,923)   (11,589) [1] 33,992 [1]  
Inventories       (4,646)       4,929 (6,030) 8,238 (10,069) 14,107   16,350 [1] 8,253 [1]  
Accrued compensation and tax withholdings       650       (979) (2,379) (7,831) 3,010 (2,825)   (4,184) [1] (19,055) [1]  
Other assets and liabilities       11,056       3,910 12,752 1,379 (535) 383   (2,487) [1] (33,655) [1]  
Net cash provided by operating activities       30,628       13,756 44,201 22,371 70,011 32,151   50,289 [1] 7,158 [1]  
Effects of exchange rate changes on cash, cash equivalents and restricted cash       (8,311)       24,548 (4,459) 16,255 4,510 15,596   21,124 [1] 44,666 [1]  
Accounts receivable, net of allowance for expected credit losses     149,490 155,038 $ 156,273       149,490         156,273    
Inventories   80,506 83,321 81,006 78,923       83,321   80,506     78,923    
Refundable income taxes         0                 0    
Prepaid expenses and other current assets   75,243 67,590 72,140 75,456       67,590   75,243     75,456    
Current assets held for sale     79,754 72,573 88,894       79,754         88,894    
Total current assets   678,478 710,596 846,282 832,807       710,596   678,478     832,807    
Total assets   2,019,135 2,041,925 2,041,210 2,100,041       2,041,925   2,019,135     2,100,041    
Derivative liability         0                 0    
Accrued VAT payable         106                 106    
Accrued compensation and benefits   31,540 26,039 28,405 27,785       26,039   31,540     27,785    
Accrued income taxes payable   8,847 10,321 6,931 9,266       10,321   8,847     9,266    
Accrued Expenses and Other Current Liabilities         46,258                 46,258    
Total current liabilities   245,435 220,713 202,467 204,839       220,713   245,435     204,839    
Long-term tax reserves         398                 398    
Long-term deferred tax liabilities   20,583 22,458 18,668 18,084       22,458   20,583     18,084    
Other Liabilities, Noncurrent         8,874                 8,874    
Total liabilities   345,501 340,433 322,244 331,074       340,433   345,501     331,074    
Retained earnings   1,370,237 1,423,043 1,463,499 1,476,839       1,423,043   1,370,237     1,476,839    
Total stockholders' equity   1,673,634 1,701,492 1,718,966 1,768,967       1,701,492   1,673,634     1,768,967    
Total liabilities and stockholders' equity   2,019,135 2,041,925 2,041,210 2,100,041       2,041,925   2,019,135     2,100,041    
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  
Basic (in shares)    
Diluted (in shares)    
Foreign currency translation adjustments   $ (223) $ (38) $ (25)         $ (63)   $ (286)     $ 0 $ 0  
Total other comprehensive income (loss), net of tax   (223) (38) (25)         (63)   (286)     0 0  
Comprehensive income (loss)   4,596 (7,243) 2,323         (4,920)   (324)     (727) (379)  
Deferred income taxes       200       $ (79) (2,298) $ 13 (360) $ (14)   186 (86)  
Accounts receivable       0       (471) 0 (471) 0 (471)   (478) 464  
Inventories       (2,976)       (444) 250 (444) 71 (444)   (454) 0  
Accrued compensation and tax withholdings       (1,287)       0 423 0 594 0   1,430 0  
Other assets and liabilities       886       (604) (1,295) (73) (1,116) (80)   (503) (1,323)  
Net cash provided by operating activities       (830)       (136) 0 (75) 0 (82)   (546) (1,324)  
Effects of exchange rate changes on cash, cash equivalents and restricted cash       0       139 0 75 0 82   546 1,324  
Accounts receivable, net of allowance for expected credit losses     (2,620) (2,779) $ (2,101)       (2,620)         (2,101)    
Inventories   341 (8,171) (6,036) (7,603)       (8,171)   341     (7,603)    
Refundable income taxes         0                 0    
Prepaid expenses and other current assets   (476) (376) (289) (230)       (376)   (476)     (230)    
Current assets held for sale     10,942 10,665 10,158       10,942         10,158    
Total current assets   (135) (225) 1,561 224       (225)   (135)     224    
Total assets   (135) (7,910) 1,561 224       (7,910)   (135)     224    
Derivative liability         0                 0    
Accrued VAT payable         0                 0    
Accrued compensation and benefits   478 297 136 1,431       297   478     1,431    
Accrued income taxes payable   (76) (78) (79) (181)       (78)   (76)     (181)    
Accrued Expenses and Other Current Liabilities         0                 0    
Total current liabilities   739 336 57 1,250       336   739     1,250    
Long-term tax reserves         0                 0    
Long-term deferred tax liabilities   (261) (144) 301 100       (144)   (261)     100    
Other Liabilities, Noncurrent         0                 0    
Total liabilities   478 (1,869) 358 1,344       (1,869)   478     1,344    
Retained earnings   (1,156) (5,978) 1,228 (1,120)       (5,978)   (1,156)     (1,120)    
Total stockholders' equity   (613) (6,041) 1,203 (1,120)       (6,041)   (613)     (1,120)    
Total liabilities and stockholders' equity   (135) (7,910) 1,561 224       (7,910)   (135)     224    
Revision of Prior Period, Reclassification, Adjustment [Member]                                
Accounts receivable, net of allowance for expected credit losses         0                 0    
Inventories         0                 0    
Refundable income taxes         23,866                 23,866    
Prepaid expenses and other current assets         (23,866)                 (23,866)    
Current assets held for sale         0                 0    
Total current assets         0                 0    
Total assets         0                 0    
Derivative liability         1,915                 1,915    
Accrued VAT payable         (106)                 (106)    
Accrued compensation and benefits         0                 0    
Accrued income taxes payable         0                 0    
Accrued Expenses and Other Current Liabilities         (1,809)                 (1,809)    
Total current liabilities         0                 0    
Long-term tax reserves         (398)                 (398)    
Long-term deferred tax liabilities         0                 0    
Other Liabilities, Noncurrent         398                 398    
Total liabilities         0                 0    
Retained earnings         0                 0    
Total stockholders' equity         0                 0    
Total liabilities and stockholders' equity         0                 0    
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.