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 19,447 3,167,322 SH   SOLE n/a 3,167,322 0 0
BOK Financial Corp Common 05561Q201 123,292 2,896,899 SH   SOLE n/a 2,896,899 0 0
DocuSign, Inc. Common 256163106 1,132 12,255 SH   SOLE n/a 12,255 0 0
Boston Omaha Corp - CL A Common 101044105 3,458 190,927 SH   OTR n/a 140,932 0 49,995
Alphabet Inc. - CL C Common 02079K107 1,985 1,707 SH   OTR n/a 0 0 1,707
Analog Devices, Inc. Common 032654105 698 7,782 SH   OTR n/a 0 0 7,782
Bank of America Corp Common 060505104 1,717 80,855 SH   OTR n/a 0 0 80,855
Berkshire Hathaway Inc. - CL B Common 084670702 3,025 16,543 SH   OTR n/a 0 0 16,543
Booking Holdings Inc. Common 09857L108 868 645 SH   OTR n/a 0 0 645
Comcast Corp - CL A Common 20030N101 1,233 35,875 SH   OTR n/a 0 0 35,875
Facebook, Inc. - CL A Common 30303M102 1,325 7,946 SH   OTR n/a 0 0 7,946
Heico Corp Common 422806109 909 12,186 SH   OTR n/a 0 0 12,186
JPMorgan Chase & Co. Common 46625H100 3,156 35,056 SH   OTR n/a 0 0 35,056
Liberty Broadband Corp - Series C Common 530307305 4,048 36,557 SH   OTR n/a 0 0 36,557
Liberty Media Corp Series C Sirius XM Group Common 531229607 1,139 36,034 SH   OTR n/a 0 0 36,034
Microsoft Corp Common 594918104 3,554 22,533 SH   OTR n/a 0 0 22,533
Mohawk Industries, Inc. Common 608190104 1,053 13,809 SH   OTR n/a 0 0 13,809
Moodys Corp Common 615369105 1,668 7,887 SH   OTR n/a 0 0 7,887
Qurate Retail, Inc. - Series A Common 74915M100 933 152,769 SH   OTR n/a 0 0 152,769
Richardson Electronics, Ltd. Common 763165107 531 138,548 SH   OTR n/a 0 0 138,548
Ryanair Holdings PLC Common 783513203 1,593 29,998 SH   OTR n/a 0 0 29,998
S&P Global Inc. Common 78409V104 1,868 7,623 SH   OTR n/a 0 0 7,623
SAP SE Common 803054204 989 8,954 SH   OTR n/a 0 0 8,954
Telefonaktiebolaget LM Ericsson - Series B Common 294821608 1,291 159,632 SH   OTR n/a 0 0 159,632
Visa Inc. - CL A Common 92826C839 1,891 11,739 SH   OTR n/a 0 0 11,739
Voxx International Corp - CL A Common 91829F104 1,011 354,740 SH   OTR n/a 0 0 354,740