Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash	$ 31,001	$ 37,956
Accounts receivable, net	5,069	3,270
Notes and interest receivable, current portion	220
Other current assets	1,059	1,263
Total current assets	37,349	42,489
Investments	1,788	1,921
Notes and interest receivable, net of current portion	3,030	2,681
Property and equipment, at cost less accumulated depreciation	7,555	6,914
Other long-term assets	4,111	3,020
Total assets	53,833	57,025
Current liabilities:
Accounts payable	781	714
Deferred revenue, current portion	794	1,322
Accrued payroll	1,543	1,901
Accrued expenses	262	321
Income tax payable	1,383	954
Other current liabilities	2,640	4,850
Total current liabilities	7,403	10,062
Noncurrent liabilities:
Deferred revenue, net of current portion	101
Deferred tax liability	818	818
Long-term lease obligation	2,864	1,994
Total noncurrent liabilities	3,783	2,812
Stockholders’ equity:
Common stock, $0.01 par value: Authorized shares - 20,000,000; Issued shares - 8,996,868 and 8,929,368 at March 31, 2021 and December 31, 2020, respectively; Outstanding shares - 8,882,350 and 8,885,797 at March 31, 2021 and December 31, 2020, respectively	90	89
Additional paid-in capital	15,999	15,836
Treasury stock, 114,518 and 43,571 shares at March 31, 2021 and December 31, 2020, respectively, at cost	(4,351)	(1,639)
Accumulated other comprehensive loss	(136)	(140)
Accumulated income	31,045	30,005
Total stockholders’ equity	42,647	44,151
Total liabilities and stockholders’ equity	$ 53,833	$ 57,025