14. QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Consolidated Statement of Operations Data:
Net revenues	$ 12,686	$ 14,702	$ 12,832	$ 11,266	$ 11,191	$ 11,118	$ 9,647	$ 10,687	$ 51,486	$ 42,643	$ 48,180
Gross profit	7,770	10,039	8,031	5,788	6,289	5,675	4,858	5,604	31,628	22,426	26,416
Net income (loss)	$ (102)	$ 2,262	$ (351)	$ (1,646)	$ 265	$ (1,528)	$ (1,740)	$ (1,512)	$ 163	$ (4,515)	$ (115)
Net income (loss) per common share - Basic		$ 0.10	$ (0.02)	$ (0.08)	$ 0.01	$ (0.07)	$ (0.08)	$ (0.07)	$ 0.01	$ (0.21)	$ (0.01)
Net income (loss) per common share - Diluted		$ 0.10	$ (0.02)	$ (0.08)	$ 0.01	$ (0.07)	$ (0.08)	$ (0.07)	$ 0.01	$ (0.21)	$ (0.01)