CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 4,669	$ 5,507
Accounts receivable, net	8,659	10,948
Inventories	8,881	8,875
Prepaid income taxes	356	514
Other current assets	565	517
Total current assets	23,130	26,361
Fixed assets, net of accumulated depreciation of $18,991 and $18,336, respectively	2,361	2,169
Goodwill	2,621	2,621
Deferred tax assets	2,295	2,308
Intangible assets, net of accumulated amortization of $3,024, and $2,779, respectively	436	458
Other assets	32	33
Total noncurrent assets	7,745	7,589
Total assets	30,875	33,950
Current liabilities:
Accounts payable	3,181	3,841
Accrued liabilities	2,329	3,339
Deferred revenue	313	169
Total current liabilities	5,823	7,349
Deferred revenue, net of current portion	68	69
Deferred rent, net of current portion	272	271
Other liabilities	245	247
Total noncurrent liabilities	585	587
Total liabilities	6,408	7,936
Shareholders' equity:
Common stock, $0.01 par value, 20,000,000 shares authorized; 11,185,331 and 11,170,881 shares issued, respectively; 7,383,364 and 7,782,292 shares outstanding, respectively	114	114
Additional paid-in capital	31,362	31,353
Retained earnings	24,763	24,756
Treasury stock, 3,851,967 and 3,388,589 shares, at cost	(100)	(99)
Treasury stock, at cost, 3,801,967 and 3,388,589 shares, respectively	(31,672)	(30,110)
Total shareholders' equity	24,467	26,014
Total liabilities and shareholders' equity	$ 30,875	$ 33,950