Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 1,412,000	$ (1,277,000)
Reconciliation of net income (loss) to cash provided by operating activities:
Depreciation and amortization expense	1,531,000	1,411,000
Amortization of debt issuance costs	21,000	21,000
Compensation costs - stock options	3,000	3,000
Provision for losses on accounts receivable	0	14,000
(Gain) loss from disposal of equipment	(3,000)	3,000
Gain on debt extinguishment	(1,964,000)	0
Change in operating assets and liabilities:
Accounts receivable	(294,000)	4,186,000
Unbilled membership dues receivable	(517,000)	(507,000)
Inventories	(324,000)	(259,000)
Prepaid expenses	(36,000)	166,000
Other assets, net	29,000	2,000
Accounts payable	(783,000)	(3,303,000)
Accrued payroll and other compensation	515,000	91,000
Accrued income taxes	16,000	(52,000)
Other accrued taxes	(85,000)	(182,000)
Deferred membership dues revenue	2,180,000	1,623,000
Other liabilities and accrued expenses	(3,000)	80,000
Net cash provided by operating activities	1,698,000	2,020,000
Cash flows from investing activities:
Capital expenditures	(1,820,000)	(2,316,000)
Proceeds from disposal of vehicle	3,000	0
Net cash used in investing activities	(1,817,000)	(2,316,000)
Cash flows from financing activities:
Proceeds under Paycheck Protection Program loans	0	2,765,000
Principal payments on term loan facilities	(549,000)	(522,000)
Principal payments on finance lease obligations	(120,000)	(115,000)
Net cash provided by (used in) financing activities	(669,000)	2,128,000
Increase (decrease) in cash, cash equivalents and restricted cash	(788,000)	1,832,000
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	7,307,000	10,463,000
Significant non-cash operating and investing activities:
Capital expenditures included in accounts payable	267,000	245,000
Significant non-cash investing and financing activities:
Operating lease right-of-use assets in exchange for lease obligations	67,000	266,000
Finance lease obligations incurred	0	391,000
Cash paid during the period for interest	574,000	585,000
Cash paid during the period for income taxes	42,000	120,000
Paycheck Protection Program CARES Act [Member]
Significant non-cash operating and financing activities:
Interest forgiven from Paycheck Protection Program loans	$ 17,000	$ 0