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Note 2 - Revenue Recognition - Impact of Adoption of New Standard on Financial Statements (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Revenues $ 77,877,000 $ 87,507,000 $ 72,653,000
Cost of revenues 7,951,000 6,953,000 6,086,000
Gross profit 69,926,000 80,554,000 66,567,000
Operating expenses:      
Sales and marketing 12,161,000 12,572,000 11,540,000
Other operating expenses 59,010,000    
Total operating expenses 71,171,000 64,681,000 52,181,000
Operating loss (1,245,000) 15,873,000 14,386,000
Financial income, net (Note 12) 3,418,000 3,026,000 2,039,000
Revaluation of investment in other company (870,000) 0 0
Income (loss) before taxes on income 1,303,000 18,899,000 16,425,000
Income taxes 729,000 1,871,000 3,325,000
Net income $ 574,000 $ 17,028,000 $ 13,100,000
Basic net income per share (in dollars per share) $ 0.03 $ 0.78 $ 0.63
Diluted net income per share (in dollars per share) $ 0.03 $ 0.75 $ 0.61
Trade receivables $ 26,156,000 $ 16,494,000  
Prepaid expenses and other current assets 5,264,000 3,747,000  
Retained earnings 62,853,000 53,873,000  
Accounting Standards Update 2014-09 [Member]      
Revenues:      
Revenues 4,078,000    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Revenues:      
Revenues 73,799,000    
Cost of revenues 7,951,000    
Gross profit 65,848,000    
Operating expenses:      
Sales and marketing 12,139,000    
Other operating expenses 59,010,000    
Total operating expenses 71,149,000    
Operating loss (5,301,000)    
Financial income, net (Note 12) 3,418,000    
Revaluation of investment in other company (870,000)    
Income (loss) before taxes on income (2,753,000)    
Income taxes 356,000    
Net income $ (3,109,000)    
Basic net income per share (in dollars per share) $ (0.14)    
Diluted net income per share (in dollars per share) $ (0.14)    
Trade receivables $ 12,875,000    
Prepaid expenses and other current assets 6,307,000    
Retained earnings 50,615,000    
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenues:      
Revenues 4,078,000    
Cost of revenues    
Gross profit 4,078,000    
Operating expenses:      
Sales and marketing 22,000    
Other operating expenses    
Total operating expenses 22,000    
Operating loss 4,056,000    
Financial income, net (Note 12)    
Revaluation of investment in other company    
Income (loss) before taxes on income 4,056,000    
Income taxes 373,000    
Net income $ 3,683,000    
Basic net income per share (in dollars per share) $ 0.17    
Diluted net income per share (in dollars per share) $ 0.16    
Trade receivables $ 13,281,000    
Prepaid expenses and other current assets (1,043,000)    
Retained earnings 12,238,000    
License [Member]      
Revenues:      
Revenues 40,446,000 $ 42,899,000 $ 31,874,000
License [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Revenues:      
Revenues 35,873,000    
License [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenues:      
Revenues 4,573,000    
Royalties [Member]      
Revenues:      
Revenues 37,431,000    
Royalties [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Revenues:      
Revenues 37,926,000    
Royalties [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]      
Revenues:      
Revenues $ (495,000)