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Note 10 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Assets and Liabilities [Abstract]
Allowance for doubtful accounts	$ 16,826us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	$ 45,148us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventory capitalization	23,185us-gaap_DeferredTaxAssetsInventory	36,591us-gaap_DeferredTaxAssetsInventory
Depreciation and amortization	(371,669)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment	(385,907)us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Investment tax credits	475,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness	600,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsGeneralBusiness
Research & development tax credits	696,865us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch	683,495us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Compensation costs	375,080us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	239,876us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Vacation accrual	242,099us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences	274,307us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsCompensatedAbsences
Accrued loss on legal settlement	1,674,500us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLegalSettlements
Net operating loss carryforward	1,674,500us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryforward	26,627us-gaap_DeferredTaxAssetsCapitalLossCarryforwards	1,135,794us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Gross deferred tax asset	4,113,093us-gaap_DeferredTaxAssetsGross	2,629,304us-gaap_DeferredTaxAssetsGross
Less valuation allowance	(475,000)us-gaap_DeferredTaxAssetsValuationAllowance	(475,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax asset	3,638,093us-gaap_DeferredTaxAssetsNet	2,154,304us-gaap_DeferredTaxAssetsNet
Net current deferred tax asset	2,887,960us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent	1,443,321us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Net long-term deferred tax asset	750,133us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent	710,983us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Net deferred tax asset	$ 3,638,093us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 2,154,304us-gaap_DeferredTaxAssetsLiabilitiesNet

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