The Securities and Exchange Commission has not necessarily reviewed the information in this filing and has not determined if it is accurate and complete.
The reader should not assume that the information is accurate and complete.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 13F

FORM 13F INFORMATION TABLE
OMB APPROVAL
OMB Number: 3235-0006
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COLUMN 1 COLUMN 2 COLUMN 3 COLUMN 4 COLUMN 5 COLUMN 6 COLUMN 7 COLUMN 8
VALUE SHRS OR SH/ PUT/ INVESTMENT OTHER VOTING AUTHORITY
NAME OF ISSUER TITLE OF CLASS CUSIP (x$1000) PRN AMT PRN CALL DISCRETION MANAGER SOLE SHARED NONE
Aspen Aerogels, Inc. Common 04523Y105 22,583 3,167,322 SH   SOLE n/a 3,167,322 0 0
BOK Financial Corp Common 05561Q201 223,883 2,966,120 SH   SOLE n/a 2,966,120 0 0
Boston Omaha Corp - CL A Common 101044105 3,997 172,662 SH   OTR n/a 140,932 0 31,730
Alphabet Inc. - CL C Common 02079K107 1,845 1,707 SH   OTR n/a 0 0 1,707
Analog Devices, Inc. Common 032654105 976 8,647 SH   OTR n/a 0 0 8,647
Berkshire Hathaway Inc. - CL B Common 084670702 3,526 16,543 SH   OTR n/a 0 0 16,443
Cimpress N.V. Common N20146101 669 7,359 SH   OTR n/a 0 0 7,359
Comcast Corp - CL A Common 20030N101 1,517 35,875 SH   OTR n/a 0 0 35,875
Costco Wholesale Corp Common 22160K105 1,172 4,434 SH   OTR n/a 0 0 4,434
Facebook, Inc. - CL A Common 30303M102 1,534 7,946 SH   OTR n/a 0 0 7,946
JPMorgan Chase & Co. Common 46625H100 3,919 35,056 SH   OTR n/a 0 0 35,056
Liberty Broadband Corp - Series C Common 530307305 3,810 36,557 SH   OTR n/a 0 0 36,557
Liberty Media Corp Series C Sirius XM Group Common 531229607 1,369 36,034 SH   OTR n/a 0 0 36,034
Microsoft Corp Common 594918104 3,019 22,533 SH   OTR n/a 0 0 22,533
Moodys Corp Common 615369105 1,540 7,887 SH   OTR n/a 0 0 7,887
Mohawk Industries, Inc. Common 608190104 1,489 10,096 SH   OTR n/a 0 0 10,096
Qurate Retail, Inc. - Series A Common 74915M100 2,097 169,273 SH   OTR n/a 0 0 169,273
Ryanair Holdings PLC Common 783513203 2,133 33,259 SH   OTR n/a 0 0 33,259
S&P Global Inc. Common 78409V104 2,014 8,842 SH   OTR n/a 0 0 8,842
TripAdvisor Inc Common 896945201 881 19,023 SH   OTR n/a 0 0 19,023
Voxx International Corp - CL A Common 91829F104 1,476 354,740 SH   OTR n/a 0 0 354,740
Wells Fargo & Co Common 949746101 1,662 35,113 SH   OTR n/a 0 0 35,113