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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Cash flows from operating activities:      
Net income $ 1,083 $ 4,684  
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 3,282 3,013  
Amortization of right-of-use assets for operating leases 4,445 5,920  
Bad debt expense 389 283  
Stock-based compensation 548 14  
Training equipment credits earned, net 10 439  
Other losses, net (139) (231)  
Changes in assets and liabilities:      
Receivables 8,108 4,065  
Prepaid expenses (1,651) (409)  
Other assets (139) 23  
Notes receivable (884) (555)  
Accounts payable and accrued expenses (8,416) (1,938)  
Deferred revenue 1,922 (695)  
Income tax receivable/payable 2,783 92  
Accrued tool sets and other current liabilities (234) 32  
Operating lease liability (5,301) (6,532)  
Other liabilities 1,977 (1,081)  
Net cash provided by operating activities 7,783 7,124  
Cash flows from investing activities:      
Proceeds from maturities of held-to-maturity securities 9,965 0  
Purchase of property and equipment (47,293) (1,811)  
Proceeds from disposal of property and equipment 6 23  
Return of capital contribution from unconsolidated affiliate 73 69  
Net cash used in investing activities (37,249) (1,719)  
Cash flows from financing activities:      
Payment of financing obligation and finance leases (32) 0  
Payment of payroll taxes on stock-based compensation through shares withheld (178) (497)  
Net cash used in financing activities (210) (497)  
Change in cash, cash equivalents and restricted cash (29,676) 4,908  
Cash and cash equivalents, beginning of period 76,803 65,442 $ 65,442
Restricted cash, beginning of period 12,116 15,113 15,113
Cash, cash equivalents and restricted cash, beginning of period 88,919 80,555 80,555
Cash and cash equivalents, end of period 44,212 70,533 76,803
Restricted cash, end of period 15,031 14,930 12,116
Cash, cash equivalents and restricted cash, end of period 59,243 85,463 88,919
Supplemental disclosure of cash flow information:      
Taxes refunded (19)   (11,300)
Taxes paid   7  
Interest paid 2 0  
Training equipment obtained in exchange for services 141 241  
Depreciation of training equipment obtained in exchange for services 317 332  
Change in accrued capital expenditures during the period 238 140  
Dividends payable 1,313 1,323 0
CARES Act funds received for institutional costs (See Note 18) $ 880 $ 0 $ 13,900