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Note A - Description of Business and Basis of Presentation (Details Textual)
 1 Months Ended 6 Months Ended
Apr. 02, 2015
May 31, 2015
USD ($)
$ / shares
shares
Apr. 30, 2015
$ / shares
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
$ / shares
shares
IPO [Member]            
Stock Issued During Period, Shares, New Issues | shares     5,090,909      
Shares Issued, Price Per Share | $ / shares   $ 11 $ 11      
Additional Common Stock Issued During Period   $ 763,636        
Proceeds from Issuance Initial Public Offering   59,900,000        
Underwriting Discounts and Commissions   4,500,000        
Offering Expenses   $ 2,800,000        
Stock Issued During Period, Shares, Conversion of Convertible Securities | shares   5,980,564        
Preferred Stock, Par or Stated Value Per Share | $ / shares   $ 0.0001 $ 0.0001 $ 0.0001   $ 0.0001
Stockholders' Equity Note, Stock Split, Conversion Ratio 7.5          
Proceeds from Issuance Initial Public Offering       $ 59,892,000  
Common Stock, Shares Authorized | shares   250,000,000 250,000,000 250,000,000   250,000,000
Preferred Stock, Shares Authorized | shares   10,000,000 10,000,000 10,000,000   10,000,000
Common Stock, Par or Stated Value Per Share | $ / shares   $ 0.0001   $ 0.0001   $ 0.0001
Unamortized Debt Issuance Expense       $ 4,000,000   $ 1,100,000