Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 1,185	$ 840
Treasury bills	7,420	7,427
Trade receivables, less allowance for doubtful accounts of $8	1,042	770
Inventories	1,528	1,515
Other current assets	177	174
Income tax receivable	0	66
Total current assets	11,352	10,792
Deferred income tax asset, net	254	198
Intangible assets, net	858	1,035
Property and equipment, net	992	1,033
Total assets	13,456	13,058
Current liabilities
Current maturities of contingent earn-out	142	0
Accounts payable	133	239
Accrued expenses	439	304
Accrued income tax	73	0
Total current liabilities	787	543
Long-term liabilities
Contingent earn-out, net of current maturities	0	195
Total long-term liabilities	0	195
Commitments and contingencies
Stockholders' equity
Common stock par value $0.10 per share; authorized 10,000,000 shares; 3,395,521 shares issued and outstanding	339	339
Additional paid-in capital	2,001	1,953
Retained earnings	10,348	10,057
Accumulated other comprehensive loss (unrealized loss on available-for-sale securities, net of income tax benefit)	(19)	(29)
Total stockholders' equity	12,669	12,320
Total liabilities and stockholders' equity	$ 13,456	$ 13,058