Note 2 - Revenue Recognition - Adoption of ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jan. 01, 2018	Dec. 31, 2017
Accounts receivable, net of allowance	$ 52,744		$ 52,744			$ 57,564
Prepaid expenses and other current assets	10,890		10,890			5,069
Deferred tax assets	17,714		17,714			16,348
Other non-current assets	8,163		8,163			10,545
Deferred revenues – current portion	7,360		7,360			7,981
Long-term income taxes payable	4,140		4,140			3,902
Other non-current liabilities	1,954		1,954			2,269
Accumulated deficit	(27,337)		(27,337)			$ (27,089)
Net income (loss)	(2,082)	$ 590	(4,602)	$ 1,297
Deferred taxes			(2,298)	(3,514)
Accounts receivable, net of allowance			5,654	(4,921)
Prepaid expenses and other current assets			(3,444)	(1,142)
Other non-current assets			2,367	1,331
Other accrued and long-term liabilities			(252)	(225)
Deferred revenue			632
Revenues	20,213	26,517	66,069	75,094
Gross margin	9,530	14,086	32,987	39,854
Selling, general and administrative	5,507	5,680	17,801	17,775
Total operating expenses	12,370	13,662	39,227	40,498
Income (loss) from operations	(2,840)	424	(6,240)	(644)
Income (loss) before taxes	(2,617)	320	(5,957)	(949)
Income tax benefit	(535)	(270)	(1,355)	(2,246)
Accounting Standards Update 2014-09 [Member]
Accumulated deficit					$ (4,400)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Accounts receivable, net of allowance	125		125
Prepaid expenses and other current assets	(3,490)		(3,490)
Deferred tax assets	435		435
Other non-current assets	(28)		(28)
Deferred revenues – current portion	2,150		2,150
Long-term income taxes payable	(1,046)		(1,046)
Other non-current liabilities	616		616
Accumulated deficit	(4,679)		(4,679)
Net income (loss)	(381)		(325)
Deferred taxes			(137)
Accounts receivable, net of allowance			(917)
Prepaid expenses and other current assets			1,100
Other non-current assets			28
Other accrued and long-term liabilities			3
Deferred revenue			248
Revenues	(522)		(539)
Gross margin	(522)		(539)
Selling, general and administrative	(49)		(122)
Total operating expenses	(49)		(122)
Income (loss) from operations	(473)		(417)
Income (loss) before taxes	(473)		(417)
Income tax benefit	(92)		(92)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Accounts receivable, net of allowance	52,869		52,869
Prepaid expenses and other current assets	7,400		7,400
Deferred tax assets	18,149		18,149
Other non-current assets	8,135		8,135
Deferred revenues – current portion	9,510		9,510
Long-term income taxes payable	3,094		3,094
Other non-current liabilities	2,570		2,570
Accumulated deficit	(32,016)		(32,016)
Net income (loss)	(2,463)		(4,927)
Deferred taxes			(2,435)
Accounts receivable, net of allowance			4,737
Prepaid expenses and other current assets			(2,344)
Other non-current assets			2,395
Other accrued and long-term liabilities			(249)
Deferred revenue			880
Revenues	19,691		65,530
Gross margin	9,008		32,448
Selling, general and administrative	5,458		17,679
Total operating expenses	12,321		39,105
Income (loss) from operations	(3,313)		(6,657)
Income (loss) before taxes	(3,090)		(6,374)
Income tax benefit	(627)		(1,447)
License and Service [Member]
Revenues	13,976	$ 19,229	47,431	$ 55,426
License and Service [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]
Revenues	(522)		(539)
License and Service [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenues	$ 13,454		$ 46,892