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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Consolidated Statements Of Comprehensive Income [Abstract]        
Net sales $ 1,760 $ 1,571 $ 3,462 $ 3,105
Cost of goods sold 744 673 1,476 1,315
Gross profit 1,016 898 1,986 1,790
Operating expenses:        
Selling and marketing 399 390 788 785
General and administrative 293 284 644 582
Research and development 216 112 381 230
Total operating expenses 908 786 1,813 1,597
Operating income 108 112 173 193
Non-operating income (expense):        
Interest expense (5) 0 (7) 0
Loss on disposal of property and equipment (1) 0 (1) 0
Gain on sale of available-for-sale securities 203 298 750 401
Interest income 1 0 2 2
Other income 5 5 9 8
Total non-operating income 203 303 753 411
Income before income taxes 311 415 926 604
Income taxes 109 145 324 168
Net income 202 270 602 436
Other comprehensive income (loss):        
Change in unrealized value of available-for-sale securities, net of income tax (157) (80) (209) (351)
Reclassification of gains included in net income, net of income tax (126) (185) (465) (249)
Net change in other comprehensive loss (283) (265) (674) (600)
Net comprehensive income (loss) $ (81) $ 5 $ (72) $ (164)
Basic        
Net income per share $ 0.06 $ 0.07 $ 0.18 $ 0.12
Weighted average shares 3,395,521 3,393,736 3,395,512 3,393,696
Diluted        
Net income per share $ 0.05 $ 0.07 $ 0.16 $ 0.12
Weighted average shares 3,658,957 3,415,716 3,650,572 3,415,676
Dividends paid per common share $ 0.00 $ 0.04 $ 0.00 $ 0.08