Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Narrative (Details)

v3.8.0.1
Stockholders' Equity - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Nov. 30, 2017
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
shares
Sep. 30, 2015
executive
$ / shares
shares
Sep. 30, 2017
shares
May 31, 2017
shares
Sep. 30, 2016
shares
Class of Stock [Line Items]                    
Stock-based compensation expense         $ 205,000 $ 411,000        
Shares issued (in dollars per share) | $ / shares $ 27.15                  
Period of consecutive trading days 20 days                  
Period following an executive's termination of employment for a number of reasons 18 months                  
Shares of common stock authorized to be repurchased (up to) (in shares) | shares     477,500 5,000,000 477,500 5,000,000   7,000,000 2,000,000 50,000
Shares purchased (in shares) | shares         7,525          
Cost of shares         $ 206,000          
Corporate, General and Administrative Expense                    
Class of Stock [Line Items]                    
Stock-based compensation expense     $ 191,000 $ 163,000 383,000 $ 418,000        
Remy W. Trafelet                    
Class of Stock [Line Items]                    
Options granted in period (in shares) | shares 300,000                  
Henry R. Slack                    
Class of Stock [Line Items]                    
Options granted in period (in shares) | shares 225,000                  
Tranche One                    
Class of Stock [Line Items]                    
Percentage of options 25.00%                  
Amount per share (in dollars per share) | $ / shares $ 60.00                  
Tranche Two                    
Class of Stock [Line Items]                    
Percentage of options 25.00%                  
Amount per share (in dollars per share) | $ / shares $ 75.00                  
Tranche Three                    
Class of Stock [Line Items]                    
Percentage of options 25.00%                  
Amount per share (in dollars per share) | $ / shares $ 90.00                  
Tranche Four                    
Class of Stock [Line Items]                    
Percentage of options 25.00%                  
Amount per share (in dollars per share) | $ / shares $ 105.00                  
Restricted Stock                    
Class of Stock [Line Items]                    
Stock-based compensation expense     37,000 27,000 63,000 211,000        
Restricted shares awarded (in shares) | shares   5,000         12,500      
Number of senior executives | executive             2      
Weighted average fair value (in dollars per share) | $ / shares   $ 31.95         $ 49.49      
Award vesting period   3 years                
Unrecognized expense $ 202,000   246,000   246,000          
Employee Stock Option                    
Class of Stock [Line Items]                    
Stock-based compensation expense       205,000   205,000        
Unrecognized expense     $ 1,619,000 $ 2,441,000 $ 1,619,000 $ 2,441,000        
Weighted average remaining contractual term         2 years 30 days          
Weighted average grant date fair value of option grants (in dollars per share) | $ / shares     $ 3.53   $ 3.53          
Two Thousand and Seventeen Authorization Program                    
Class of Stock [Line Items]                    
Shares purchased (in shares) | shares     7,525   7,525          
Cost of shares     $ 205,639   $ 205,639          
Authorized amount     $ 3,730,544   $ 3,730,544          
Minimum | Restricted Stock                    
Class of Stock [Line Items]                    
Award vesting period             3 years      
Maximum | Restricted Stock                    
Class of Stock [Line Items]                    
Award vesting period             5 years