Note 10 - Income Taxes (Detail) - The provision for income taxes differs from the amount computed by applying the statutory federal income tax rate: (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income for the year before provision for income taxes	$ 6,428,298	$ 3,450,610	$ 2,327,793
Computed expected tax expense	2,185,621	1,173,207	791,450
State income taxes	16,071	8,627	5,819
Permanent differences, including foreign exchange	21,728	13,700	(22,812)
Investment tax credits recovered	(106,941)	(41,833)	(50,311)
Other, including alternative minimum tax and adjustments to opening deferred tax assets	(112,323)	(218,252)	82,928
Change in beginning of the year balance of the valuation allowance allocated to income tax expense		(3,655,070)	(596,229)
Provision for (recovery of) income taxes	$ 2,004,156	$ (2,719,621)	$ 210,845

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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