Quarterly report pursuant to Section 13 or 15(d)

Capital Structure - Initial Public Offering (Details)

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Capital Structure - Initial Public Offering (Details) - USD ($)
Apr. 27, 2017
Nov. 23, 2015
Oct. 20, 2015
Private Placement      
Class of Stock [Line Items]      
Exercise price per share (usd per share) $ 0.40    
Gross proceeds $ 5,000,000    
IPO | Capital Unit      
Class of Stock [Line Items]      
Common stock issued (in shares)     4,000,000
Share price (usd per share)     $ 6.50
Gross proceeds     $ 26,000,000
Net proceeds from IPO     23,600,000
Over-Allotment Option      
Class of Stock [Line Items]      
Gross proceeds   $ 135,319  
Underwriters Unit Purchase Option | Capital Unit      
Class of Stock [Line Items]      
Proceeds from unit purchase option     $ 100
Units available, as a percentage of units sold     1.00%
Equity purchase option unit, exercise price per unit (usd per share)     $ 7.48
Equity purchase option unit, exercise price as percent of IPO price     115.00%
Underwriters Unit Purchase Option | Capital Unit | Maximum      
Class of Stock [Line Items]      
Number of units available under the option (in shares)     40,000
Class A Warrant      
Class of Stock [Line Items]      
Number of shares per warrant     1
Class A Warrant | IPO      
Class of Stock [Line Items]      
Number of equity instruments (in shares)     1
Exercise price per share (usd per share)     $ 4.55
Class A Warrant | Over-Allotment Option      
Class of Stock [Line Items]      
Common stock issued (in shares)   551,900  
Class A Warrant | Underwriters Unit Purchase Option      
Class of Stock [Line Items]      
Exercise price per share (usd per share)     5.23
Equity purchase option, unit exercise price after first warrant expiration (usd per share)     7.475
Equity purchase option, unit exercise price after second warrant expiration (usd per share)     $ 7.47
Class B Warrant | IPO      
Class of Stock [Line Items]      
Number of equity instruments (in shares)     1
Exercise price per share (usd per share)     $ 3.90
Class B Warrant | Over-Allotment Option      
Class of Stock [Line Items]      
Common stock issued (in shares)   551,900  
Class B Warrant | Underwriters Unit Purchase Option      
Class of Stock [Line Items]      
Exercise price per share (usd per share)     $ 4.49
Common Stock | IPO      
Class of Stock [Line Items]      
Number of equity instruments (in shares)     1
Common Stock | Over-Allotment Option      
Class of Stock [Line Items]      
Common stock issued (in shares)   20,000  
Common Stock | Class A Warrant | Over-Allotment Option      
Class of Stock [Line Items]      
Number of shares per warrant   1  
Common Stock | Class B Warrant      
Class of Stock [Line Items]      
Number of shares per warrant     0.5
Common Stock | Class B Warrant | Over-Allotment Option      
Class of Stock [Line Items]      
Number of shares per warrant   0.5