Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash	$ 26,210	$ 37,956
Accounts receivable, net	7,048	3,270
Notes and interest receivable, current portion	220	0
Other current assets	1,377	1,263
Total current assets	34,855	42,489
Investments	2,654	1,921
Notes and interest receivable, net of current portion	3,012	2,681
Property and equipment, at cost less accumulated depreciation	7,790	6,914
Other long-term assets	4,304	3,020
Total assets	52,615	57,025
Current liabilities:
Accounts payable	1,266	714
Deferred revenue, current portion	1,040	1,322
Accrued payroll	2,368	1,901
Accrued expenses	354	321
Income tax payable	606	954
Other current liabilities	2,782	4,850
Total current liabilities	8,416	10,062
Noncurrent liabilities:
Deferred revenue, net of current portion	88	0
Deferred tax liability	818	818
Long-term lease obligation	2,687	1,994
Total noncurrent liabilities	3,593	2,812
Stockholders’ equity:
Common stock, $0.01 par value: Authorized shares - 20,000,000; Issued shares - 9,001,311 and 8,929,368 at June 30, 2021 and December 31, 2020, respectively; Outstanding shares - 8,742,599 and 8,885,797 at June 30, 2021 and December 31, 2020, respectively	90	89
Additional paid-in capital	16,197	15,836
Treasury stock, 258,712 and 43,571 shares at June 30, 2021 and December 31, 2020, respectively, at cost	(9,399)	(1,639)
Accumulated other comprehensive loss	(132)	(140)
Accumulated income	33,850	30,005
Total stockholders’ equity	40,606	44,151
Total liabilities and stockholders’ equity	$ 52,615	$ 57,025