CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net loss from continuing operations	$ (884,000)	$ (5,683,000)
Net income from discontinued operations	0	12,584,000
Non-cash charges:
Depreciation and amortization	1,309,000	1,620,000
Amortization of other intangible assets	800,000	1,016,000
Amortization of debt issue costs	64,000	128,000
Provision for doubtful accounts	66,000	4,000
Stock-based compensation	80,000	13,000
Restricted stock-based compensation	38,000	50,000
Loss (gain) on sale of fixed assets	21,000	(1,700,000)
Deferred income taxes	912,000	(3,946,000)
Fair value increase in contingent consideration	158,000	0
Impairment of goodwill and other intangible assets	0	9,581,000
Changes in operating assets and liabilities:
Accounts receivable	(1,384,000)	498,000
Inventories	1,913,000	(316,000)
Prepaid expenses and other current assets	1,857,000	(2,006,000)
Other assets	45,000	58,000
Accounts payable	40,000	(372,000)
Accrued compensation and benefits	120,000	24,000
Accrued other liabilities	(502,000)	390,000
Other liabilities	(19,000)	(18,000)
Total adjustments	5,518,000	5,024,000
Net cash provided by (used in) operating activities - continuing operations	4,634,000	(659,000)
Net cash used in operating activities - discontinued operations	0	(499,000)
Net cash provided by (used in) operating activities	4,634,000	(1,158,000)
Cash Flows from Investing Activities:
Capital expenditures	(910,000)	(1,066,000)
Proceeds from disposal of assets	12,000	3,512,000
Purchase of net assets of Jiffy Air Tool, Inc.	(6,845,000)	0
Purchase of patents	(200,000)	0
Net cash (used in) provided by investing activities - continuing operations	(7,943,000)	2,446,000
Net cash provided by investing activities - discontinued operations	0	20,149,000
Net cash (used in) provided by investing activities	(7,943,000)	22,595,000
Cash Flows from Financing Activities:
Dividend payments	(722,000)	(2,335,000)
Proceeds from exercise of stock options	62,000	23,000
Purchase of Class A common stock	(358,000)	(255,000)
Net proceeds from short-term borrowings	1,928,000	9,087,000
Repayments of term loans	0	(6,343,000)
Repayments of notes payable	(14,000)	(29,000)
Excess tax benefit on stock-based compensation	0	(18,000)
Payments of debt issue costs	(84,000)	(30,000)
Net cash provided by financing activities - continuing operations	812,000	100,000
Net cash used in financing activities - discontinued operations	0	(18,716,000)
Net cash provided by (used in) financing activities	812,000	(18,616,000)
Effect of exchange rate changes on cash	39,000	(49,000)
Net (decrease) increase in cash	(2,458,000)	2,772,000
Cash at beginning of year	3,699,000	927,000
Cash at end of year	1,241,000	3,699,000
Supplemental disclosures of cash flow information:
Cash paid for: Interest	97,000	133,000
Cash paid for: Income taxes	409,000	112,000
Supplemental disclosures of non-cash investing and financing activities:
Contingent consideration on acquisition	$ 692,000	$ 0