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Note 8 - Shareholders' Equity - Shareholders' Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Balance, beginning of period $ 52,201      
Balance, end of period 49,979 $ 56,874    
Foreign currency translation adjustment (27) 22    
Net loss (2,349) (1,846)    
Total shareholders' equity 49,979 56,874 $ 49,979 $ 56,874
Common Stock [Member]        
Balance, beginning of period 17 8    
Balance, end of period 17 8    
Total shareholders' equity 17 8 17 8
Additional Paid-in Capital [Member]        
Balance, beginning of period 57,840 47,464    
Balance, end of period 57,923 47,612    
Share-based compensation expense 74 137    
Proceeds from employee stock purchase plan 9 11    
Total shareholders' equity 57,840 47,464 57,923 47,612
AOCI Attributable to Parent [Member]        
Balance, beginning of period (181) (65)    
Balance, end of period (137) (113)    
Unrealized gain (loss) on available-for-sale securities, net of tax 70 (70)    
Foreign currency translation adjustment (26) 22    
Total shareholders' equity (181) (65) (137) (113)
Retained Earnings [Member]        
Balance, beginning of period (5,475) 9,160    
Balance, end of period (7,824) 9,367    
Stock repurchased (147)    
Cash dividends, $0.07 per share (583)    
Impact on retained earnings for change in revenue recognition policy     2,783
Net loss (2,349) (1,846)    
Total shareholders' equity $ (5,475) $ 9,160 $ (7,824) $ 9,367