Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 5,659	$ 4,870
Restricted cash	350
Accounts receivable (net of allowance for doubtful accounts of $2,215 and $1,877, respectively)	14,523	10,766
Inventories:
Raw materials and components, net	1,330	1,376
Work in process	419	362
Finished goods, net	2,194	3,083
Total inventories, net	3,943	4,821
Income tax receivable	330	495
Other current assets	1,852	1,290
Total current assets	26,657	22,242
Property, plant and equipment (net of accumulated depreciation of $9,379 and $8,780 respectively)	14,244	10,826
Equity method investments	12,017	18,053
Intangible assets, net	1,818	3,972
Goodwill	922	952
Notes receivable	3,768	2,815
Other assets	405	154
Total assets	59,831	59,014
Current liabilities:
Accounts payable	3,558	3,425
Accrued expenses	3,562	3,071
Short-term debt	2,607	500
Current portion of long-term debt	983	65
Deferred revenue and customer deposits	2,993	1,619
Income tax payable	22
Total current liabilities	13,725	8,680
Long-term debt, net of current portion and debt issuance costs	9,721	1,870
Deferred revenue and customer deposits, net of current portion	1,182	1,207
Deferred income taxes	2,636	2,816
Other accrued expenses, net of current portion	184	319
Total liabilities	27,448	14,892
Stockholders' equity:
Preferred stock, par value $.01 per share; authorized 1,000 shares; none outstanding
Common stock, par value $.01 per share; authorized 25,000 shares; issued 17,237 and 17,216 shares at September 30, 2018 and December 31, 2017, respectively; outstanding 14,443 and 14,422 shares at September 30, 2018 and December 31, 2017, respectively	169	169
Additional paid-in capital	41,285	40,565
Accumulated other comprehensive loss:
Foreign currency translation	(4,633)	(4,048)
Postretirement benefit obligations	114	99
Unrealized gain on available-for-sale securities of equity method investments	150	353
Retained earnings	13,884	25,570
Stockholders' equity before treasury stock	50,969	62,708
Less 2,794 of common shares in treasury, at cost	(18,586)	(18,586)
Total stockholders' equity	32,383	44,122
Total liabilities and stockholders' equity	$ 59,831	$ 59,014