Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 670	$ 840
Treasury bills, fair value	7,422	7,427
Trade receivables, less allowance for doubtful accounts of $8	827	770
Inventories	1,550	1,515
Other current assets	176	174
Income tax receivable	80	66
Total current assets	10,725	10,792
Deferred income tax asset, long term	233	198
Intangible assets, net	976	1,035
Property and equipment, net	1,026	1,033
Total assets	12,960	13,058
Current liabilities
Current maturities of contingent earn-out	195	0
Accounts payable current	142	239
Accrued expenses current	370	304
Total current liabilities	707	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	1,970	1,953
Retained earnings	9,973	10,057
Accumulated other comprehensive loss (unrealized loss on available-for-sale securities, net of income tax benefit)	(29)	(29)
Total stockholders' equity	12,253	12,320
Total liabilities and stockholders' equity	$ 12,960	$ 13,058