Note 16 - Quarterly Financial Data (Unaudited) (Detail) - Summary of Quarterly Financial Data (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Gross profit (in Dollars)	$ 45,905,674	$ 40,337,159	$ 36,250,857
Net income from continuing operations (in Dollars)	5,596,070	4,753,969	4,158,491
Net income (in Dollars)	5,596,070	4,752,601	4,160,257
Basic	$ 0.55	$ 0.47	$ 0.41
Diluted	$ 0.55	$ 0.47	$ 0.41
Basic	$ 0.55	$ 0.47	$ 0.41
Diluted	$ 0.55	$ 0.47	$ 0.41
Diluted (in Shares)	10,175,346	10,182,098	10,251,863
First Quarter [Member]
Net sales (in Dollars)	18,177,078	15,879,040
Gross profit (in Dollars)	11,365,633	9,524,848
Net income from continuing operations (in Dollars)	1,574,105	1,150,576
Net income (in Dollars)	1,574,105	1,150,576
Basic	$ 0.15	$ 0.11
Diluted	$ 0.15	$ 0.11
Basic	$ 0.15	$ 0.11
Diluted	$ 0.15	$ 0.11
Basic (in Shares)	10,156,442	10,156,442
Diluted (in Shares)	10,172,950	10,169,701
Second Quarter [Member]
Net sales (in Dollars)	16,904,254	15,933,921
Gross profit (in Dollars)	10,940,201	9,845,254
Net income from continuing operations (in Dollars)	1,539,639	1,076,356
Net income (in Dollars)	1,539,639	1,076,356
Basic	$ 0.15	$ 0.11
Diluted	$ 0.15	$ 0.11
Basic	$ 0.15	$ 0.11
Diluted	$ 0.15	$ 0.11
Basic (in Shares)	10,156,442	10,156,442
Diluted (in Shares)	10,172,171	10,168,098
Third Quarter [Member]
Net sales (in Dollars)	17,000,728	15,385,421
Gross profit (in Dollars)	10,404,770	9,238,278
Net income from continuing operations (in Dollars)	280,770	830,474
Net income (in Dollars)	280,770	829,106
Basic	$ 0.03	$ 0.08
Diluted	$ 0.03	$ 0.08
Basic	$ 0.03	$ 0.08
Diluted	$ 0.03	$ 0.08
Basic (in Shares)	10,156,442	10,156,442
Diluted (in Shares)	10,177,466	10,168,326
Fourth Quarter [Member]
Net sales (in Dollars)	20,638,564	18,904,565
Gross profit (in Dollars)	13,195,070	11,728,779
Net income from continuing operations (in Dollars)	2,201,556	1,696,563
Net income (in Dollars)	$ 2,201,556	$ 1,696,563
Basic	$ 0.22	$ 0.17
Diluted	$ 0.22	$ 0.17
Basic	$ 0.22	$ 0.17
Diluted	$ 0.22	$ 0.17
Basic (in Shares)	10,159,877	10,156,442
Diluted (in Shares)	10,178,759	10,166,658