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Note F - Common Stock Activity (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Balance (in shares)     14,490,954  
Common stock warrants exercised (in shares)     141,095 12,251
Common stock options exercised (in shares) 14,933 0 14,933 0
Balance (in shares) 14,646,982   14,646,982