Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 1,631	$ 1,190
Treasury bills	6,342	6,542
Available-for-sale securities	542	1,256
Trade receivables, less allowance for doubtful accounts of $8 and $10, respectively	926	738
Inventories	1,346	1,224
Other current assets	179	163
Total current assets	10,966	11,113
Intangible assets, net	1,447	1,505
Property and equipment, net	1,121	1,146
Total assets	13,534	13,764
Current liabilities
Current maturities of note payable	390	381
Accounts payable current	227	126
Accrued expenses current	397	392
Accrued income tax	222	82
Total current liabilities	1,236	981
Long-term liabilities
Note payable - long term	0	390
Contingent earn-out	472	472
Deferred income tax liability	163	391
Total long-term liabilities	635	1,253
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	1,832	1,816
Retained earnings	9,194	8,641
Accumulated other comprehensive income (unrealized gain on available-for-sale securities, net of income tax)	298	734
Total stockholders' equity	11,663	11,530
Total liabilities and stockholders' equity	$ 13,534	$ 13,764