Note 15 - Quarterly Consolidated Financial Data (Unaudited) (Details) - Quarterly Consolidated Financial Data (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Quarterly Consolidated Financial Data [Abstract]
Net revenues	$ 9,862	$ 10,794	$ 12,343	$ 8,797	$ 9,335	$ 9,900	$ 11,218	$ 8,973	$ 41,796	$ 39,426
Gross margin	5,027	5,168	6,082	4,185	4,689	4,756	5,465	4,105	20,462	19,015
Earnings before income tax expense	1,176	1,268	2,054	411	1,037	1,114	1,487	370	4,909	4,008
Income tax expense	217	431	697	125	345	24	484	78	1,470	931
Net earnings	$ 959	$ 837	$ 1,357	$ 286	$ 692	$ 1,090	$ 1,003	$ 292	$ 3,439	$ 3,077
Net earnings per common share - basic (in Dollars per share)	$ 0.09	$ 0.08	$ 0.13	$ 0.03	$ 0.07	$ 0.11	$ 0.10	$ 0.03	$ 0.33	$ 0.30
Weighted average common shares outstanding - basic (in Shares)	10,454,716	10,440,803	10,436,730	10,393,956	10,377,678	10,377,189	10,371,716	10,327,428	10,431,743	10,363,678
Net earnings per common share - diluted (in Dollars per share)	$ 0.09	$ 0.08	$ 0.13	$ 0.03	$ 0.07	$ 0.10	$ 0.10	$ 0.03	$ 0.33	$ 0.30
Weighted average common shares outstanding - diluted (in Shares)	10,480,867	10,477,814	10,456,183	10,448,911	10,435,096	10,404,095	10,394,094	10,366,312	10,466,064	10,419,103