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Note 12 - Stockholders' Equity - Stockholders' Equity Transactions (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Balances | $ 37,817,086 |
Exercise of stock options (in shares) | 68,876 | 11,574
Exercise of stock options | $ 19,869 |
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration | (712,234) |
Income tax effect related to stock options exercised |  |
Stock-based compensation (note 14) | 317,820 |
Net income | 2,446,491 | $ 4,438,238
Accretion of redeemable non-controlling interest in TingÂ Virginia, LLC. | (12,499) |
Other comprehensive income (loss) | 105,609 | $ 883,520
Balances | $ 39,982,142 |
Common Stock [Member] |  |
Balances (in shares) | 10,461,574 |
Balances | $ 14,460,500 |
Exercise of stock options (in shares) | 68,876 |
Exercise of stock options | $ 322,656 |
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration (in shares) | (26,298) |
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration |  |
Income tax effect related to stock options exercised |  |
Stock-based compensation (note 14) |  |
Accretion of redeemable non-controlling interest in TingÂ Virginia, LLC. |  |
Other comprehensive income (loss) |  |
Balances (in shares) | 10,504,152 |
Balances | $ 14,783,156 |
Additional Paid-in Capital [Member] |  |
Balances | 2,857,921 |
Exercise of stock options | (302,787) |
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration | (712,234) |
Income tax effect related to stock options exercised |  |
Stock-based compensation (note 14) | 317,820 |
Accretion of redeemable non-controlling interest in TingÂ Virginia, LLC. |  |
Other comprehensive income (loss) |  |
Balances | 2,160,720 |
Retained Earnings [Member] |  |
Balances | 20,399,511 |
Exercise of stock options |  |
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration |  |
Income tax effect related to stock options exercised |  |
Stock-based compensation (note 14) |  |
Net income | 2,446,491 |
Accretion of redeemable non-controlling interest in TingÂ Virginia, LLC. | (12,499) |
Other comprehensive income (loss) |  |
Balances | 22,833,503 |
AOCI Attributable to Parent [Member] |  |
Balances | 99,154 |
Exercise of stock options |  |
Shares deducted from exercise of stock options for payment of witholding taxes and exercise consideration |  |
Income tax effect related to stock options exercised |  |
Stock-based compensation (note 14) |  |
Accretion of redeemable non-controlling interest in TingÂ Virginia, LLC. |  |
Other comprehensive income (loss) | 105,609 |
Balances | $ 204,763 |

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