Note 16 - Quarterly Consolidated Financial Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Net revenues	$ 7,939	$ 9,203	$ 11,559	$ 10,188	$ 9,862	$ 10,794	$ 12,343	$ 8,797	$ 38,889	$ 41,796
Gross margin	3,611	4,323	5,846	4,918	5,027	5,168	6,082	4,185	18,698	20,462
Earnings (loss) before income tax expense (benefit)	(154)	407	1,659	671	1,176	1,268	2,054	411	2,583	4,909
Income tax expense (benefit)	(187)	97	579	233	217	431	697	125	722	1,470
Net earnings	$ 33	$ 310	$ 1,080	$ 438	$ 959	$ 837	$ 1,357	$ 286	$ 1,861	$ 3,439
Net earnings per common share - basic (in dollars per share)	$ 0	$ 0.03	$ 0.10	$ 0.04	$ 0.09	$ 0.08	$ 0.13	$ 0.03	$ 0.18	$ 0.33
Weighted average common shares outstanding - basic (in shares)	10,481,612	10,473,928	10,471,888	10,465,414	10,454,716	10,440,803	10,436,730	10,393,956	10,473,210	10,431,743
Net earnings per common share - diluted (in dollars per share)	$ 0	$ 0.03	$ 0.10	$ 0.04	$ 0.09	$ 0.08	$ 0.13	$ 0.03	$ 0.18	$ 0.33
Weighted average common shares outstanding - diluted (in shares)	10,498,369	10,498,911	10,494,457	10,483,527	10,480,867	10,477,814	10,456,183	10,448,911	10,493,830	10,466,064