Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ 688,000	$ (830,000)
Reconciliation of net income (loss) to cash provided by (used in) operating activities:
Depreciation and amortization expense	764,000	699,000
Amortization of debt issuance costs	11,000	10,000
Compensation costs - stock options	1,000	1,000
Provision for losses on accounts receivable	(5,000)	5,000
(Gain) loss from disposal of equipment	(3,000)	3,000
Gain on debt extinguishment	(1,087,000)
Change in operating assets and liabilities:
Accounts receivable	(1,939,000)	1,027,000
Unbilled membership dues receivable	(116,000)	(211,000)
Inventories	(228,000)	(236,000)
Prepaid expenses	(163,000)	(135,000)
Other assets, net	30,000
Accounts payable	1,155,000	(1,679,000)
Accrued payroll and other compensation	293,000	74,000
Accrued income taxes	24,000	(21,000)
Other accrued taxes	(39,000)	(29,000)
Deferred membership dues revenue	926,000	865,000
Other liabilities and accrued expenses	(49,000)	57,000
Net cash provided by (used in) operating activities	263,000	(400,000)
Cash flows from investing activities:
Capital expenditures	(668,000)	(977,000)
Proceeds from disposal of vehicle	3,000
Net cash used in investing activities	(665,000)	(977,000)
Cash flows from financing activities:
Principal payments on term loan facilities	(273,000)	(259,000)
Principal payments on finance lease obligations	(14,000)	(24,000)
Net cash used in financing activities	(287,000)	(283,000)
Decrease in cash, cash equivalents and restricted cash	(689,000)	(1,660,000)
Cash, cash equivalents and restricted cash at beginning of period	8,095,000	8,631,000
Cash, cash equivalents and restricted cash at end of period	7,406,000	6,971,000
Significant non-cash operating and investing activities:
Capital expenditures included in accounts payable	192,000	367,000
Significant non-cash investing and financing activities:
Operating lease right-of-use assets in exchange for lease obligations	37,000
Finance lease obligations incurred		47,000
Cash paid during the period for interest	296,000	294,000
Cash paid during the period for income taxes	19,000	65,000
Paycheck Protection Program CARES Act [Member]
Significant non-cash operating and financing activities:
Interest forgiven from Paycheck Protection Program loans	$ 8,000