Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income (loss)	$ (996,000)	$ 1,412,000
Reconciliation of net income (loss) to cash provided by operating activities:
Depreciation and amortization expense	1,671,000	1,531,000
Amortization of debt issuance costs	21,000	21,000
Compensation costs - stock options	2,000	3,000
Provision for losses on accounts receivable	6,000	0
Gain from disposal of equipment	0	(3,000)
Gain on debt extinguishment	0	(1,964,000)
Change in operating assets and liabilities:
Accounts receivable	(527,000)	(294,000)
Unbilled membership dues receivable	(567,000)	(517,000)
Inventories	(425,000)	(324,000)
Prepaid expenses	57,000	(36,000)
Other assets, net	11,000	29,000
Accounts payable	(349,000)	(783,000)
Accrued payroll and other compensation	932,000	515,000
Accrued income taxes	28,000	16,000
Other accrued taxes	(200,000)	(85,000)
Deferred membership dues revenue	2,419,000	2,180,000
Other liabilities and accrued expenses	36,000	(3,000)
Net cash provided by operating activities	2,119,000	1,698,000
Cash flows from investing activities:
Capital expenditures	(3,304,000)	(1,820,000)
Proceeds from disposal of equipment	0	3,000
Net cash used in investing activities	(3,304,000)	(1,817,000)
Cash flows from financing activities:
Principal payments on term loan facilities	(577,000)	(549,000)
Principal payments on finance lease obligations	(63,000)	(120,000)
Net cash used in financing activities	(498,000)	(669,000)
Decrease in cash, cash equivalents and restricted cash	(1,683,000)	(788,000)
Cash, cash equivalents and restricted cash at beginning of period	4,950,000	8,095,000
Cash, cash equivalents and restricted cash at end of period	3,267,000	7,307,000
Significant non-cash operating and investing activities:
Capital expenditures included in accounts payable	1,139,000	267,000
Significant non-cash investing and financing activities:
Operating lease right-of-use assets in exchange for lease obligations	31,000	67,000
Cash paid during the period for interest	525,000	574,000
Cash paid during the period for income taxes	25,000	42,000
Paycheck Protection Program CARES Act [Member]
Significant non-cash operating and financing activities:
Interest forgiven from Paycheck Protection Program loans	0	17,000
Subsidiaries [Member]
Cash flows from financing activities:
Proceeds from subsidiary private placement offering	$ 142,000	$ 0