Note 15 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Note 15 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (Unaudited) [Line Items]
Gross profit	$ 49,328,024	$ 45,905,674	$ 40,337,159
Net income from continuing operations	7,265,717	5,596,070	4,753,969
Net income	7,265,717	5,596,070	4,752,601
Net income from continuing operations per common share, Basic	$ 0.71	$ 0.55	$ 0.47
Net income from continuing operations per common share, Diluted	$ 0.71	$ 0.55	$ 0.47
Net income per common share, Basic	$ 0.71	$ 0.55	$ 0.47
Net income per common share, Diluted	$ 0.71	$ 0.55	$ 0.47
Weighted average number of common shares outstanding, Basic	10,176,492	10,157,395	10,156,442
Weighted average number of common shares outstanding, Diluted	10,216,438	10,175,346	10,182,098
First Quarter [Member]
Note 15 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (Unaudited) [Line Items]
Net sales	19,237,827	18,177,078
Gross profit	11,930,829	11,365,633
Net income from continuing operations	1,586,321	1,574,105
Net income	1,586,321	1,574,105
Net income from continuing operations per common share, Basic	$ 0.16	$ 0.15
Net income from continuing operations per common share, Diluted	$ 0.16	$ 0.15
Net income per common share, Basic	$ 0.16	$ 0.15
Net income per common share, Diluted	$ 0.16	$ 0.15
Weighted average number of common shares outstanding, Basic	10,162,442	10,156,442
Weighted average number of common shares outstanding, Diluted	10,194,219	10,172,950
Second Quarter [Member]
Note 15 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (Unaudited) [Line Items]
Net sales	18,973,013	16,904,254
Gross profit	11,920,121	10,940,201
Net income from continuing operations	1,629,353	1,539,639
Net income	1,629,353	1,539,639
Net income from continuing operations per common share, Basic	$ 0.16	$ 0.15
Net income from continuing operations per common share, Diluted	$ 0.16	$ 0.15
Net income per common share, Basic	$ 0.16	$ 0.15
Net income per common share, Diluted	$ 0.16	$ 0.15
Weighted average number of common shares outstanding, Basic	10,167,649	10,156,442
Weighted average number of common shares outstanding, Diluted	10,216,535	10,172,171
Third Quarter [Member]
Note 15 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (Unaudited) [Line Items]
Net sales	18,524,604	17,000,728
Gross profit	11,700,943	10,404,770
Net income from continuing operations	1,561,832	280,770
Net income	1,561,832	280,770
Net income from continuing operations per common share, Basic	$ 0.15	$ 0.03
Net income from continuing operations per common share, Diluted	$ 0.15	$ 0.03
Net income per common share, Basic	$ 0.15	$ 0.03
Net income per common share, Diluted	$ 0.15	$ 0.03
Weighted average number of common shares outstanding, Basic	10,176,744	10,156,442
Weighted average number of common shares outstanding, Diluted	10,221,512	10,177,466
Fourth Quarter [Member]
Note 15 - Quarterly Financial Data (Unaudited) (Details) - Summary of Quarterly Financial Data (Unaudited) [Line Items]
Net sales	21,549,141	20,638,564
Gross profit	13,776,131	13,195,070
Net income from continuing operations	2,488,211	2,201,556
Net income	$ 2,488,211	$ 2,201,556
Net income from continuing operations per common share, Basic	$ 0.24	$ 0.22
Net income from continuing operations per common share, Diluted	$ 0.24	$ 0.22
Net income per common share, Basic	$ 0.24	$ 0.22
Net income per common share, Diluted	$ 0.24	$ 0.22
Weighted average number of common shares outstanding, Basic	10,198,733	10,159,877
Weighted average number of common shares outstanding, Diluted	10,233,009	10,178,759