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Note 16 - Supplemental information: (Detail) - Summary of valuation and qualifying accounts: (USD $)
 12 Months Ended
Dec. 31, 2011
2011 [Member]
Dec. 31, 2010
2010 [Member]
Dec. 31, 2012
2012 [Member]
Dec. 31, 2011
2011 [Member]
Dec. 31, 2010
2010 [Member]
Allowance for doubtful accounts, including provision for credit notes          
Balance at beginning year     $ 62,415 $ 65,000 $ 115,000
Charged to (recovered) costs and expenses     16,555 (2,585) (50,000)
Balance at end of year     78,970 62,415 65,000
Valuation allowance for deferred tax asset:          
Balance at beginning year 3,655,070 4,251,000      
Charged to (recovered) costs and expenses (3,655,070) (595,930)      
Balance at end of year   $ 3,655,070