Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-17-014239-index-headers.html | 2017-08-09 12:58:19 | |
| 0001437749-17-014239-index.html | 2017-08-09 12:58:19 | |
| 0001437749-17-014239.txt | 2017-08-09 12:58:19 | |
 0001437749-17-014239-xbrl.zip | 258176 | 2017-08-09 12:58:19 |
 a1.jpg | 22766 | 2017-08-09 12:58:19 |
| ex31-1.htm | 9458 | 2017-08-09 12:58:19 |
| ex31-2.htm | 9438 | 2017-08-09 12:58:19 |
| ex32-1.htm | 5198 | 2017-08-09 12:58:19 |
| ex32-2.htm | 5320 | 2017-08-09 12:58:19 |
| FilingSummary.xml | 55166 | 2017-08-09 12:58:19 |
| Financial_Report.xlsx | 101525 | 2017-08-09 12:58:19 |
| ottr-20170630.xml | 3096168 | 2017-08-09 12:58:19 |
| ottr-20170630.xsd | 127338 | 2017-08-09 12:58:19 |
| ottr-20170630_cal.xml | 59837 | 2017-08-09 12:58:19 |
| ottr-20170630_def.xml | 609076 | 2017-08-09 12:58:19 |
| ottr-20170630_lab.xml | 556353 | 2017-08-09 12:58:19 |
| ottr-20170630_pre.xml | 643930 | 2017-08-09 12:58:19 |
| ottr20170630_10q.htm | 1903659 | 2017-08-09 12:58:19 |
| R1.htm | 27441 | 2017-08-09 12:58:19 |
| R10.htm | 175208 | 2017-08-09 12:58:19 |
| R11.htm | 188007 | 2017-08-09 12:58:19 |
| R12.htm | 30937 | 2017-08-09 12:58:19 |
| R13.htm | 84274 | 2017-08-09 12:58:19 |
| R14.htm | 52686 | 2017-08-09 12:58:19 |
| R15.htm | 10740 | 2017-08-09 12:58:19 |
| R16.htm | 22047 | 2017-08-09 12:58:19 |
| R17.htm | 108888 | 2017-08-09 12:58:19 |
| R18.htm | 112715 | 2017-08-09 12:58:19 |
| R19.htm | 20440 | 2017-08-09 12:58:19 |
| R2.htm | 128769 | 2017-08-09 12:58:19 |
| R20.htm | 57380 | 2017-08-09 12:58:19 |
| R21.htm | 18606 | 2017-08-09 12:58:19 |
| R22.htm | 205178 | 2017-08-09 12:58:19 |
| R23.htm | 130152 | 2017-08-09 12:58:19 |
| R24.htm | 94413 | 2017-08-09 12:58:19 |
| R25.htm | 136661 | 2017-08-09 12:58:19 |
| R26.htm | 165461 | 2017-08-09 12:58:19 |
| R27.htm | 30330 | 2017-08-09 12:58:19 |
| R28.htm | 80127 | 2017-08-09 12:58:19 |
| R29.htm | 44693 | 2017-08-09 12:58:19 |
| R3.htm | 16879 | 2017-08-09 12:58:19 |
| R30.htm | 105461 | 2017-08-09 12:58:19 |
| R31.htm | 107288 | 2017-08-09 12:58:19 |
| R32.htm | 16080 | 2017-08-09 12:58:19 |
| R33.htm | 55397 | 2017-08-09 12:58:19 |
| R34.htm | 14757 | 2017-08-09 12:58:19 |
| R35.htm | 8267 | 2017-08-09 12:58:19 |
| R36.htm | 21785 | 2017-08-09 12:58:19 |
| R37.htm | 9780 | 2017-08-09 12:58:19 |
| R38.htm | 14807 | 2017-08-09 12:58:19 |
| R39.htm | 23145 | 2017-08-09 12:58:19 |
| R4.htm | 79389 | 2017-08-09 12:58:19 |
| R40.htm | 4103 | 2017-08-09 12:58:19 |
| R41.htm | 10710 | 2017-08-09 12:58:19 |
| R42.htm | 2816 | 2017-08-09 12:58:19 |
| R43.htm | 8329 | 2017-08-09 12:58:19 |
| R44.htm | 33911 | 2017-08-09 12:58:19 |
| R45.htm | 83612 | 2017-08-09 12:58:19 |
| R46.htm | 38076 | 2017-08-09 12:58:19 |
| R47.htm | 9091 | 2017-08-09 12:58:19 |
| R48.htm | 88228 | 2017-08-09 12:58:19 |
| R49.htm | 20897 | 2017-08-09 12:58:19 |
| R5.htm | 4364 | 2017-08-09 12:58:19 |
| R50.htm | 3934 | 2017-08-09 12:58:19 |
| R51.htm | 115723 | 2017-08-09 12:58:19 |
| R52.htm | 8452 | 2017-08-09 12:58:19 |
| R53.htm | 8974 | 2017-08-09 12:58:19 |
| R54.htm | 8965 | 2017-08-09 12:58:19 |
| R55.htm | 6639 | 2017-08-09 12:58:19 |
| R56.htm | 41254 | 2017-08-09 12:58:19 |
| R57.htm | 3354 | 2017-08-09 12:58:19 |
| R58.htm | 27776 | 2017-08-09 12:58:19 |
| R59.htm | 19072 | 2017-08-09 12:58:19 |
| R6.htm | 31114 | 2017-08-09 12:58:19 |
| R60.htm | 24336 | 2017-08-09 12:58:19 |
| R61.htm | 22707 | 2017-08-09 12:58:19 |
| R62.htm | 15976 | 2017-08-09 12:58:19 |
| R63.htm | 4542 | 2017-08-09 12:58:19 |
| R64.htm | 11724 | 2017-08-09 12:58:19 |
| R65.htm | 18818 | 2017-08-09 12:58:19 |
| R66.htm | 14985 | 2017-08-09 12:58:19 |
| R67.htm | 15782 | 2017-08-09 12:58:19 |
| R68.htm | 47739 | 2017-08-09 12:58:19 |
| R69.htm | 27558 | 2017-08-09 12:58:19 |
| R7.htm | 86346 | 2017-08-09 12:58:19 |
| R70.htm | 5169 | 2017-08-09 12:58:19 |
| R71.htm | 38823 | 2017-08-09 12:58:19 |
| R72.htm | 12559 | 2017-08-09 12:58:19 |
| R73.htm | 9009 | 2017-08-09 12:58:19 |
| R74.htm | 8521 | 2017-08-09 12:58:19 |
| R75.htm | 29841 | 2017-08-09 12:58:19 |
| R76.htm | 3102 | 2017-08-09 12:58:19 |
| R77.htm | 9531 | 2017-08-09 12:58:19 |
| R78.htm | 5196 | 2017-08-09 12:58:19 |
| R79.htm | 9581 | 2017-08-09 12:58:19 |
| R8.htm | 168477 | 2017-08-09 12:58:19 |
| R9.htm | 104224 | 2017-08-09 12:58:19 |
| report.css | 2767 | 2017-08-09 12:58:19 |
| Show.js | 1410 | 2017-08-09 12:58:19 |