CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Cash and cash equivalents	$ 6,820,000	$ 6,483,000
Allowance for doubtful accounts	800,000	300,000
Prepaid expenses and other current assets	6,036,000	5,141,000
Property and equipment, net	92,138,000	93,475,000
Other assets	389,000	477,000
Accounts payable	24,073,000	18,470,000
Accrued expenses	8,343,000	7,813,000
Customer deposits	1,448,000	1,215,000
Long-term debt, current portion	1,190,000	1,178,000
Long-term debt, net of current portion	200,000	200,000
Other liabilities	$ 2,524,000	$ 3,837,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	19,832,417	19,827,417
Common stock, shares outstanding (in shares)	19,809,417	19,804,417
Treasury stock, par value (in dollars per share)	$ 0.001	$ 0.001
Treasury stock, shares (in shares)	23,000	23,000
VIE, Primary Beneficiary
Cash and cash equivalents	$ 5,200,000	$ 1,200,000
Prepaid expenses and other current assets	200,000	100,000
Property and equipment, net	46,300,000	46,600,000
Other assets	100,000	100,000
Accounts payable	200,000	100,000
Accrued expenses	200,000	100,000
Customer deposits	100,000	100,000
Long-term debt, current portion	1,200,000	1,200,000
Long-term debt, net of current portion	42,000,000	35,300,000
Debt discount	200,000	200,000
Other liabilities	$ 1,300,000	$ 2,600,000