Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member] Series B Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Comprehensive Deficit [Member]
BALANCE at Dec. 31, 2018	$ 20,563		$ 28	$ 256,626	$ (236,091)
BALANCE, Shares at Dec. 31, 2018		1,000
BALANCE, Shares at Dec. 31, 2018			28,242,000
Non-cash compensation recognized on stock options and ESPP	18			18
Restricted stock grants, net of cancellations	770		$ 1	769
Restricted stock grants, net of cancellations, shares			1,225,000
Cancellation of shares for payment of withholding tax	(315)			(315)
Cancellation of shares for payment of withholding tax, shares			(138,000)
Employee stock purchase plan	5			5
Employee stock purchase plan, shares			2,000
Common shares issued in stock offering, net of offering costs	(14)			(14)
Common shares issued in connection with Smart Retail acquisition, net	5,129		$ 3	5,126
Common shares issued in connection, with Smart Retail acquisition, net, shares			2,699,000
Exercise of warrants, shares			3,000
Conversion of preferred stock to common stock, shares			9,000
Preferred stock dividends	(67)				(67)
Cumulative effect of adoption of ASC | ASC 842 [Member]	93				93
Net income	3,484				3,484
BALANCE at Jun. 30, 2019	29,666		$ 32	262,215	(232,581)
BALANCE, Shares at Jun. 30, 2019		1,000
BALANCE, Shares at Jun. 30, 2019			32,042,000
BALANCE at Mar. 31, 2019	26,038		$ 32	261,990	(235,984)
BALANCE, Shares at Mar. 31, 2019		1,000
BALANCE, Shares at Mar. 31, 2019			32,065,000
Non-cash compensation recognized on stock options and ESPP	10			10
Restricted stock grants, net of cancellations	323			323
Cancellation of shares for payment of withholding tax	(108)			(108)
Cancellation of shares for payment of withholding tax, shares			(35,000)
Exercise of warrants, shares			3,000
Conversion of preferred stock to common stock, shares			9,000
Preferred stock dividends	(34)				(34)
Other	1				1
Net income	3,436				3,436
BALANCE at Jun. 30, 2019	29,666		$ 32	262,215	(232,581)
BALANCE, Shares at Jun. 30, 2019		1,000
BALANCE, Shares at Jun. 30, 2019			32,042,000
BALANCE at Dec. 31, 2019	$ 48,684		$ 38	274,041	(225,395)
BALANCE, Shares at Dec. 31, 2019	5,500
BALANCE, Shares at Dec. 31, 2019	38,475,084		38,475,000
Non-cash compensation recognized on stock options and ESPP	$ 30			30
Restricted stock grants, net of cancellations	1,411		$ 1	1,410
Restricted stock grants, net of cancellations, shares			1,000,000
Cancellation of shares for payment of withholding tax	(868)			(868)
Cancellation of shares for payment of withholding tax, shares			(176,000)
Employee stock purchase plan	5			5
Employee stock purchase plan, shares			2,000
Exercise of warrants	4,196		$ 2	4,194
Exercise of warrants, shares			2,047,000
Exercise of stock options	16			16
Exercise of stock options, shares			8,000
Net income	3,424				3,424
BALANCE at Jun. 30, 2020	$ 56,898		$ 41	278,828	(221,971)
BALANCE, Shares at Jun. 30, 2020	5,500
BALANCE, Shares at Jun. 30, 2020	41,355,673		41,356,000
BALANCE at Mar. 31, 2020	$ 52,853		$ 40	276,163	(223,350)
BALANCE, Shares at Mar. 31, 2020			40,383,000
Non-cash compensation recognized on stock options and ESPP	17			17
Restricted stock grants, net of cancellations	791			791
Cancellation of shares for payment of withholding tax	(296)			(296)
Cancellation of shares for payment of withholding tax, shares			(66,000)
Exercise of warrants	2,151		$ 1	2,150
Exercise of warrants, shares			1,038,000
Exercise of stock options	3			3
Exercise of stock options, shares			1,000
Net income	1,379				1,379
BALANCE at Jun. 30, 2020	$ 56,898		$ 41	$ 278,828	$ (221,971)
BALANCE, Shares at Jun. 30, 2020	5,500
BALANCE, Shares at Jun. 30, 2020	41,355,673		41,356,000