XML 34 R24.htm IDEA: XBRL DOCUMENT v3.20.4
Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Jan. 31, 2020
Oct. 31, 2019
Jul. 31, 2019
Jan. 31, 2021
Jan. 31, 2020
Apr. 30, 2020
May 01, 2019
Accounting Policies [Abstract]                    
Cash equivalents $ 0           $ 0   $ 0  
Net income 740,000 $ 1,000 $ 75,000 $ 407,000 $ 307,000 $ (641,000) 816,000 $ 72,000    
Net cash provided by (used in) operating activities             299,000 360,000    
Accumulated deficit 71,857,000           71,857,000   72,673,000  
Working capital deficit 2,600,000           2,600,000      
Cash and cash equivalents 7,429,000           7,429,000   8,342,000  
Unrecognized tax benefits 181,000           181,000   178,000  
Income tax penalties and interest expense             3,000      
Unrecognized Tax Benefits Income Tax Penalties Anticipate Additional Unrecognized             4,500      
Provision for income taxes 15,000     $ 12,000     43,000 $ 38,000    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Operating lease right-of-use assets, net $ 5,380,000           $ 5,380,000   $ 2,798,000  
Cumulative Effect, Period of Adoption, Adjustment                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Operating lease right-of-use assets, net                   $ 3,200,000
Deferred rent                   900,000
Operating lease liability                   $ 4,100,000