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Recent Accounting Pronouncements - Condensed Consolidated Statements of Operations and Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Oct. 01, 2018
Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect of initial application $ 158      
Income Statement [Abstract]        
Total sales 18,980      
Total cost of sales 14,631 $ 12,267    
Gross profit 4,349 4,363    
Operating income 15 165    
Income tax expense 2 1,153    
Net income 50 (995)    
Net income (loss) attributable to common stockholders $ 48 $ (1,200)    
Basic earnings per share (usd per share) $ 0.01 $ (0.32)    
Diluted earnings per share (usd per share) $ 0.01 $ (0.32)    
Assets:        
Accounts receivable $ 17,208     $ 11,980
Unbilled accounts receivable 0     1,166
Inventories 6,790     7,558
Other current assets 2,318     1,878
Deferred tax asset 1,837     1,895
Liabilities:        
Deferred revenue 738      
Shareholders' Equity:        
Retained earnings 29,531     $ 29,926
Balances without adoption of ASC 606        
Income Statement [Abstract]        
Total sales 18,874      
Total cost of sales 14,500      
Gross profit 4,374      
Operating income 40      
Income tax expense 3      
Net income 74      
Net income (loss) attributable to common stockholders $ 71      
Basic earnings per share (usd per share) $ 0      
Diluted earnings per share (usd per share) $ 0      
Assets:        
Accounts receivable $ 17,071      
Unbilled accounts receivable 646      
Inventories 7,108      
Other current assets 1,657      
Deferred tax asset 1,832      
Liabilities:        
Deferred revenue 1,122      
Shareholders' Equity:        
Retained earnings 29,373      
Effect of change Higher/(Lower) | Accounting Standards Update 2014-09        
Income Statement [Abstract]        
Total sales 106      
Total cost of sales 131      
Gross profit (25)      
Operating income (25)      
Income tax expense (1)      
Net income (24)      
Net income (loss) attributable to common stockholders $ (23)      
Basic earnings per share (usd per share) $ 0      
Diluted earnings per share (usd per share) $ 0      
Assets:        
Accounts receivable $ 137      
Unbilled accounts receivable (646)      
Inventories (318)      
Other current assets 661      
Deferred tax asset 5      
Liabilities:        
Deferred revenue (384)      
Shareholders' Equity:        
Retained earnings $ 158      
Retained Earnings | Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Cumulative effect of initial application     $ 158