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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue:        
Software licenses $ 4,433 $ 4,136 $ 8,332 $ 12,257
Software maintenance 1,088 1,288 3,623 3,750
Services 343 426 924 1,061
Hardware       317
Royalties 41 49 118 252
Total revenue 5,905 5,899 12,997 17,637
Costs and expenses:        
Cost of software licenses 27   274 1,101
Cost of services 178 146 499 517
Cost of hardware       234
Research and development 2,151 1,752 5,884 5,204
Selling and marketing 1,054 1,069 3,020 3,100
General and administrative 849 857 2,454 2,452
Total costs and expenses 4,259 3,824 12,131 12,608
Patent related income 19 238 1,422 238
Operating income 1,665 2,313 2,288 5,267
Other income     36  
Interest income 109 76 281 215
Income before provision for income taxes 1,774 2,389 2,605 5,482
Provision for income taxes 545 816 742 1,839
Net income $ 1,229 $ 1,573 $ 1,863 $ 3,643
Net income per share - basic (in dollars per share) $ 0.06 $ 0.07 $ 0.09 $ 0.16
Net income per share - diluted (in dollars per share) $ 0.06 $ 0.07 $ 0.08 $ 0.16
Weighted-average shares - basic (in shares) 21,679 22,847 21,900 22,934
Weighted-average shares - diluted (in shares) 21,758 22,939 21,967 22,996
Comprehensive income:        
Net income $ 1,229 $ 1,573 $ 1,863 $ 3,643
Other comprehensive income (net of tax):        
Unrealized gains on available for sale securities   37 19 24
Comprehensive income $ 1,229 $ 1,610 $ 1,882 $ 3,667