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INFORMATION ABOUT THE COMPANY'S OPERATIONS IN DIFFERENT INDUSTRY SEGMENTS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Apr. 30, 2018
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues $ 9,340 $ 10,379 $ 30,663 $ 30,880  
Net (loss) income [1] (32) (2,851) 84 (1,125)  
Provision (benefit) for income taxes (186) 3,136 (285) 3,987  
Interest expense (income), net [1],[2] 8 18 20 49  
Depreciation 269 [1] 319 [1] 842 954  
EBITDA [1],[3] 59 622 661 3,865  
Capital expenditures 28 [1] 101 [1] 62 130  
Total assets 104,510 105,838 [1] 104,510 105,838 [1] $ 105,670
Real Estate          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues [1] 2,391 2,671 9,266 6,894  
Net (loss) income [1] (944) (727) (1,921) (1,124)  
Provision (benefit) for income taxes [1] 263 29 (80) (175)  
Interest expense (income), net [1],[2] 591 575 1,768 1,623  
Depreciation [1] 22 30 66 65  
EBITDA [1],[3] (68) (93) (167) 389  
Capital expenditures [1] 5 52 5 52  
Total assets [1] 78,572 74,519 78,572 74,519  
Fulfillment Services [Member]          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues [1],[4] 6,916 7,676 21,302 23,910  
Net (loss) income [1],[4] 634 (2,043) 922 (443)  
Provision (benefit) for income taxes [1],[4] (751) 2,539 (670) 3,364  
Interest expense (income), net [1],[2],[4] 298 288 885 884  
Depreciation [1],[4] 247 289 776 889  
EBITDA [1],[3],[4] 428 1,073 1,913 4,694  
Capital expenditures [1],[4] 23 49 57 78  
Total assets [1],[4] 21,584 22,312 21,584 22,312  
Corporate and Other [Member]          
Segment Reporting, Revenue Reconciling Item [Line Items]          
Revenues [1] 33 32 95 76  
Net (loss) income [1] 278 (81) 1,083 442  
Provision (benefit) for income taxes [1] 302 568 465 798  
Interest expense (income), net [1],[2] (881) (845) (2,633) (2,458)  
Depreciation [1] 0 0 0 0  
EBITDA [1],[3] (301) (358) (1,085) (1,218)  
Capital expenditures [1] 0 0 0 0  
Total assets [1] $ 4,354 $ 9,007 $ 4,354 $ 9,007  
[1] Revenue information provided for each segment includes amounts grouped as Other in the accompanying consolidated statements of operations. Corporate and Other is net of intercompany eliminations.
[2] Interest expense (income), net includes inter-segment interest expense (income) that is eliminated in consolidation.
[3] The Company uses EBITDA (which the Company defines as net (loss) income before net interest expense (income), income taxes, and depreciation and amortization), in addition to net (loss) income as a key measure of profit or loss for segment performance and evaluation purposes.
[4] Fulfillment services revenues and EBITDA for the first nine months of 2018 included a pre-tax gain of $1,318,000 resulting from the settlement agreement with the State of Florida (see Note 7).