Note 10 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2012			2011
Current:
Federal	$	135,031		$	476,857
State		7,782			98,481
Total current tax provision		142,813			575,338
Deferred:
Federal		(150,999	)		454,559
State		(27,308	)		(21,380	)
Total deferred tax provision		(178,307	)		433,179
Income tax (benefit) expense	$	(35,494	)	$	1,008,517

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	2012			2011
Allowance for doubtful accounts	$	13,618		$	10,873
Inventory capitalization		15,792			10,509
Depreciation and amortization		(585,231	)		(622,307	)
Investment tax credits		600,000			600,000
Research & development tax credits		435,051			431,006
Compensation costs		235,384			250,931
Vacation accrual		250,046			268,104
Capital loss carryforward		268,237			105,474
Gross deferred tax asset		1,232,897			1,054,590
Less valuation allowance		(475,000	)		(475,000	)
Net deferred tax asset	$	757,897		$	579,590
Net current deferred tax asset		189,153			189,510
Net long-term deferred tax asset		568,744			390,080
Net deferred tax asset	$	757,897		$	579,590

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2012			2011
Expected provision at federal statutory tax rate (34%)	$	136,031		$	1,627,798
State taxes, net of federal benefit		(12,887	)		50,887
Depreciation & amortization		----			----
Stock-based compensation expense		(112,008	)		(297,471	)
Domestic production activities deduction		(16,298	)		(145,453	)
Capital loss carryforward		104,138			(85,384	)
Federal research & development credit		(98,726	)		(169,172	)
Other permanent differences		(35,744	)		27,312
Income tax expense (benefit)	$	(35,494	)	$	1,008,517